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 Table of Contents    
REVIEW ARTICLE  
Year : 2011  |  Volume : 36  |  Issue : 5  |  Page : 23-31
 

What are the Evidence Based Public Health Interventions for Prevention and Control of NCDs in Relation to India?


1 Centre for Chronic Disease Control (CCDC), New Delhi and Centre for Cardio-metabolic Disease Risk Reduction in South Asia - Centre of Excellence (CARRS - COE), India
2 Public Health Foundation of India, India
3 CCDC and CARRS-COE, New Delhi, India

Date of Submission01-Dec-2011
Date of Acceptance14-Dec-2011
Date of Web Publication5-Apr-2012

Correspondence Address:
Dorairaj Prabhakaran
Centre for Chronic Disease Control, C 1/52, Second Floor, Safdarjung Development Area, New Delhi- 110 016
India
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DOI: 10.4103/0970-0218.94705

PMID: 22628907

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   Abstract 

The accelerating epidemics of noncommunicable diseases (NCDs) in India call for a comprehensive public health response which can effectively combat and control them before they peak and inflict severe damage in terms of unaffordable health, economic, and social costs. To synthesize and present recent evidences regarding the effectiveness of several types of public health interventions to reduce NCD burden. Interventions influencing behavioral risk factors (like unhealthy diet, physical inactivity, tobacco and alcohol consumption) through policy, public education, or a combination of both have been demonstrated to be effective in reducing the NCD risk in populations as well as in individuals. Policy interventions are also effective in reducing the levels of several major biological risk factors linked to NCDs (high blood pressure; overweight and obesity; diabetes and abnormal blood cholesterol). Secondary prevention along the lines of combination pills and ensuring evidenced based clinical care are also critical. Though the evidence for health promotion and primary prevention are weaker, policy interventions and secondary prevention when combined with these are likely to have a greater impact on reducing national NCD burden. A comprehensive and integrated response to NCDs control and prevention needs a "life course approach." Proven cost-effective interventions need to be integrated in a NCD prevention and control policy framework and implemented through coordinated mechanisms of regulation, environment modification, education, and health care responses.


Keywords: Evidence base, India, NCD, public health interventions


How to cite this article:
Singh K, Reddy K S, Prabhakaran D. What are the Evidence Based Public Health Interventions for Prevention and Control of NCDs in Relation to India?. Indian J Community Med 2011;36, Suppl S1:23-31

How to cite this URL:
Singh K, Reddy K S, Prabhakaran D. What are the Evidence Based Public Health Interventions for Prevention and Control of NCDs in Relation to India?. Indian J Community Med [serial online] 2011 [cited 2014 Nov 1];36, Suppl S1:23-31. Available from: http://www.ijcm.org.in/text.asp?2011/36/5/23/94705



   Introduction Top


Noncommunicable diseases (NCDs) represent a cluster of major chronic diseases including cardiovascular diseases (CVDs), diabetes, stroke, cancers, and chronic obstructive pulmonary disease (COPD). A progressive rise in the burden of NCDs is attributable to the demographic and developmental transitions which are occurring in India accompanied by an epidemiological transition. [1] Recent estimates project that NCDs accounted for the highest proportion of deaths (nearly 50%) in 2004. [2] Many of these deaths occur before the age of 65 years. Over the next two decades, these diseases will contribute to rising high burdens of death and disability, with adverse impact on national development due to productivity losses which arise from premature death and prolonged disability. [3]

Therefore, there is a need to urgently formulate and implement prevention policies to reduce the burden of NCDs in India. In this review, we discuss the evidence for public health interventions in reducing NCD burden from both developed and developing countries and describe how such interventions can be contextualised to the Indian perspective.


   Scientific Basis for Prevention and Control of NCDs: Risk Factor Concept Top


NCDs have multiple determinants, including several risk factors which are common to different diseases. The "risk factor" concept provides the scientific basis for prevention and control of NCDs. [4],[5] Since risk factors exert a steadily rising effect on the risk of disease and interact with each other to increase the overall risk, strategies for prevention must attempt "to reduce risk" across the "whole population" and simultaneously "deal with multiple risk factors." Behavioral risk factors such as unhealthy diet (diet rich in salt, sugar, and fat and low in fruit and vegetable intake), physical inactivity (sedentary life), tobacco consumption (tobacco smoking and use of non-smoking forms of tobacco), and alcohol use have been shown to increase the risk of several NCDs. Public health interventions which influence these behaviors through policy, public education, or a combination of both have the potential to be effective in reducing the risk of NCDs in populations as well as in individuals. Such interventions are also likely to be effective in reducing the levels of several major biological risk factors linked to NCDs (such as high blood pressure; overweight and obesity; diabetes; abnormal blood cholesterol).

Approaches to Prevention

A life course approach with a combination of population-based and high-risk strategies is recommended considering their synergistic, complementary, cost-effective, and sustainable impact on reducing NCD burden in India.

A "life course approach" is essential for prevention and control of NCDs in populations. This approach starts with maternal health, prenatal nutrition, pregnancy outcomes, proper feeding practices in infancy, and child and adolescent health through reaching children at school, youngsters at college, followed by interventions targeting adults to encourage healthy diet, regular physical activity, and avoidance of tobacco from youth into old age. In addition, those with manifest disease will need cost-effective medical interventions.

The "population approach" aims at reducing the risk factor levels in the population as a whole through community action. Since there is a continuum of risk associated with most NCD risk factors, this mass change is expected to result in mass benefit across a wide range of risk. [6] The "high-risk approach" aims at identifying persons with markedly elevated risk factors, and also for people who have had an event and, therefore, at the highest risk of diseases. These individuals are then targeted for interventions to reduce risk factor levels. While many consider that the overall benefits to society are limited in terms of deaths or disability avoided as the number of such persons is proportionately small in comparison with the total number at risk. However, given the rising burden of NCD risk factors, the high risk approach also have a role to play and should constitute a major component of public health interventions.

Although, the population strategy has the advantage of being lifestyle linked, inexpensive, and behaviorally more appropriate, the high-risk approach which is often pharmacological are more expensive but due to the large quantum of projected risk and anticipated benefit elicits better motivation in both patients and health care providers. [7]


   Evidence from Published Literature Top


Key findings, from a vast body of published global research in relation to public health interventions reducing NCDs burden, are summarized below.

Reduction in tobacco use

Tax increases on tobacco products, with a resultant rise in their prices, have been shown to reduce tobacco consumption. [8] The effect is especially greater on young persons and people in low-income groups who have limited disposable incomes and have a higher level of price-elasticity for tobacco consumption. This effect has been observed in many countries across high income and low/middle income countries with greater gain in saving number of deaths at latter. The World Bank has estimated that a 10% increase in tobacco prices can save up to 9 millions of lives in developing countries and around 1 millions of deaths in developed countries. [8]

A comprehensive ban on tobacco advertisement and promotion reduces the industry-driven demand for tobacco products and their consumption levels, especially among young persons. Partial bans are less effective. While the effects of such advertising bans are complementary to enhanced public awareness of the dangers of tobacco use, countries which have implemented a comprehensive ban have shown steeper rates of decline in tobacco consumption in comparison to those with no ban or partial bans.

Reduced exposure to second hand smoke (also called environmental tobacco smoke) decreases the dangers due to passive smoking. This can be achieved by bans on smoking in public places, public transport and indoor work places to reduce such harmful exposure to non-smokers. Such bans also promote tobacco cessation among smokers or at least reduce their consumption levels. [9] The health benefits of such bans are evident in a surprisingly short time-frame [Box 1]. [10]



In order to facilitate a comprehensive reduction in the use of tobacco and its products, India ratified the WHO Framework Convention on Tobacco Control which recommends several demand reduction measures and some supply reduction measures as components to be integrated into a comprehensive national strategy for tobacco control. Furthermore, the WHO has recommended the mpower package [11] which helps facilitate the implementation of six effective tobacco control measures proven to reduce tobacco use as described below:



Cessation of tobacco use is best promoted through a strategy which combines policy interventions such as raising taxes on tobacco products, advertising bans, health warnings on tobacco products, mass health education, behavioral counseling in community- and clinic-based settings in addition to the use of pharmacologic aids when indicated (nicotine replacement therapy or drugs like bupropion may be used). [11],[12]

Reduction in alcohol use

Recently the WHO has published a review of 1265 studies undertaken globally regarding prevention of psychoactive substance use. [13] Available literature indicates that no single intervention is effective, while combined and coordinated strategies are beneficial. Important public health interventions targeting reduction in alcohol use are summarized below.

Supply reduction measures

Sale to minors (Age at which alcohol is legally sold): For each delayed year of initiation into alcohol drinking, there is a significant reduction in the likelihood of developing alcoholism and the lifetime risk of alcohol abuse. Increasing the minimum drinking age results in reduction of adolescent drinking and road crashes. [14] Another analytical study proposes that making 21 years as the uniform age at which alcohol is legally available in countries like India can bring about a prohibition like effect to the extent of 50-60%. [15]

Price of the Alcoholic Drinks: The real price of the alcoholic drink significantly influences the type of drink consumed and the quantum consumed; taxation on alcoholic drinks directly affects the price of alcohol and plays an important role in mitigating the harm from alcohol. The state of Uttar Pradesh in India saw a doubling of beer consumption for the years 99-00 and 00-01 when market price of beer was reduced by 15-20%. [16] An evaluation of population based program in Australia, which included increasing the real price of alcohol demonstrated reduction in estimated alcohol caused deaths, hospital admissions for non-road injuries, road crash injuries, per capita consumption, and also self-reported hazardous consumption over the 9 year period. [17]

Demand reduction measures

Screening for Alcohol and its Related Problems (Early Detection and Brief Screening): Inpatient treatment may be required only for severely dependent patients, while brief out-patient interventions may be suitable, and cost-effective options for less severe forms of alcohol dependence. [18],[19] Short-term successes have been demonstrated in the designated de-addiction centers with respect to those who have a hazardous and dependant drinking patterns. Multiple modes of therapy and appropriate rehabilitation are constituents of a successful program. [20]

Work place initiatives

The workplace alcohol prevention program among the public sector Road Transport Corporation workers in Bangalore demonstrated that an effective and early intervention for employees with alcohol-related problems was associated with reduction in accident rates and other violent incidents. [21] Similar experience has been demonstrated in other countries as well. [22],[23]

Mass Media, Community-Based Awareness Programs and Health Promotion Complementary and reciprocal community actions pursued in conjunction are more effective than media campaigns alone. Community initiatives are more successful in influencing public perception of the problems, their knowledge base, and acceptance of policy alternatives than effecting changes in individual consumption levels. Complementary general health/life skills education produces greater changes in behavior and can ideally be integrated into a school curriculum. [24]

Interventions promoting healthy diet

Experience from Poland shows that significant benefit can accrue from population wide preventive measures, in terms of NCD mortality declines, even in a short time frame [Box 2].



Based on extensive global evidence, WHO's global strategy on diet, physical activity, and health recommended several measures which would promote health and reduce the risk of NCDs [26],[27],[28] as presented below:

  • Achieve energy balance and a healthy weight
  • Limit energy intake from total fats and shift fat consumption away from saturated fats to unsaturated fats and toward the elimination of trans-fatty acids
  • Increase consumption of fruits and vegetables, and legumes, whole grains, and nuts
  • Limit the intake of free sugars
  • Limit salt consumption from all sources and ensure that salt is iodized
Population-based studies, some involving long term follow up, show that persons who consume less salt (<6 g/day) are less likely to suffer from hypertension than those who consume a higher amount (>10 g/day). [29],[30],[31],[32]

Overweight and obesity are best prevented by adopting healthy dietary practices (avoiding excess intake of calorie-rich foods and ensuring adequate intake of high-fiber foods like fruits and vegetables) as well as regular physical activity (which provides for adequate energy expenditure). Other potential interventions for which evidence of benefit is available are:

Exclusion of trans-fats from the diet and limiting saturated fat intake to less than 10% of daily energy intake (preferable around 7%), and [27],[33],[34] regular intake of fish (on at least 2 days a week). [35] Other foods (such as soya and nuts like almonds, walnuts pistachio, and peanuts) also have favorable effects on blood lipids. [27],[35]

Intake of fruits and vegetables (which contain anti-atherogenic soluble fiber, anti-oxidant vitamins, and other phytonutrients) help to alter the effects of blood lipids on blood vessels. [28],[35] The minimum recommended intake is five servings of fruits and vegetables daily. But in India, a very small proportion of people are able to achieve this minimum goal due to high costs. Therefore, policy measures through multisectoral action are needed to increase the availability of fruits and vegetables. Further measures are needed to prevent loss during storage and transportation. Encouraging consumption of locally available and inexpensive fruits and vegetables could be an alternative strategy.

Increasing physical activity

Increased physical activity has been shown to have a favorable effect on blood pressure, cholesterol and reducing obesity and overweight. Physical activity can be enhanced by interventions at the personal, family, community, and national/sub-national levels. The success of a mass campaign for the promotion of physical activity is illustrated by the "Agita Sao Paulo" program of Brazil [Box 3]. [29]



Public health interventions, for which evidence exists to support their effectiveness in increasing physical activity, are summarized below [Table 1].
Table 1: Interventions to promote physical activity: Effects and evidence*

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Many studies show an association between the built environment and physical activity levels, but few studies are able to show that changes to the built environment will directly lead to improvements in activity. [36],[37] The current body of evidence is relatively weak in showing that changes to the built environment will promote activity. However, many communities are undertaking efforts to improve the built environment. These efforts provide important research opportunities to examine the impact of built environment changes on activity.

A multi-faceted approach may be needed to increase activity in communities as many intersecting factors influence physical activity. Changes to community environments will need to be combined with policy changes, health promotion activities, greater social support for activity, and individual interventions that incorporate theories of behavior change.

Community mobilization

A landmark study in Finland, involving a comprehensive community-based intervention in North Karelia, showed that the program substantially lowered NCD risk factor levels and mortality rates over a 20 year period. [38],[39],[40] However, it should be noted that the control population also demonstrated similar reductions. Potential explanations include secular changes, contamination, or a policy effect which affected the whole population.

Another "healthy living" program in Mauritius, which combined health education of people with policy changes leading to the substitution of palm oil with soyabean oil, as subsidized "ration oil," resulted in the reduction of multiple NCD risk factors within a 5 year period [Table 2]. [41]
Table 2: Results of NCD intervention in mauritius

Click here to view


China has been implementing several community-based projects for NCD prevention and control. Starting with the city of Tianjan in 1984, a total of 32 demonstration sites have been organized across the country. Notable outcomes so far have included a reduction in the annual CVD deaths in those patients with high blood pressure who were being managed, from 1.6% to 0.8% between 2000 and 2002. In Shenyang, there was a reduction in the prevalence of adult smokers from 29% to 13% between 1997 and 2002 and an increase in the proportion of people participating in planned regular physical activity from 41% to 84% in the same period. [42],[43]

The benefits of health promotion not only benefit adults who are at an immediate risk of NCD, but also pass on the benefits to other immediate and distant family members who will grow without exposure to NCD risk factors.

Secondary prevention

Best example for secondary prevention of CVD

Persons who have an established CVD, or even preceding conditions like angina or transient ischemic attack, are at a high risk of a future heart attack, stroke, or sudden death. Early diagnosis and management is highly effective in reducing the risk of recurrent adverse events in such persons. [4] This is possible through the use of drugs like aspirin, beta blockers, statins, ACE inhibitors and diuretics. These drugs have been shown to be protective, alone and in combination, in many clinical trials. [44],[45],[46],[47],[48],[49] Health care delivery systems must be made effective vehicles for providing the benefits of such secondary prevention to those who need it. The costs, however, are a constraint. The recent development of combination pills containing off-patent generic medications holds promise for highly affordable and effective treatment. Evidence is emerging on the use of polypill strategy in high-risk populations.

Prevention of cancers

Cancers of lung, stomach, liver, esophageal and colorectum are major types seen among men while cancers of cervical, breast, stomach, lung, esophagus account for the top five cancers among women. [50] Among primary prevention interventions for cancers, immunization against liver cancer (HBV) is currently in widespread use. Cervical cancer (HPV) vaccination for cervical cancer prevention permits later age of screening and less frequent screening interval, which is likely to be cost-effective for developing countries. [51] Early detection of cancers through screening offers enough opportunity for effective early treatment. Studies in India have proved that the lifetime risk for cervical cancer was reduced by 25-35% with a single lifetime screening by either one-visit Visual Inspection after application of acetic acid (VIA) or two-visit HPV DNA testing targeted at women age 35-40 years. Risk was reduced by more than 50% if screening was performed two or three times per lifetime and would be extremely cost-effective. [51] Furthermore, tobacco control policies and programs, particularly among children and adolescents, would result in greatest potential gain in life years.

Prevention of chronic respiratory diseases of Indoor air pollution origin

The use of solid fuels such as biomass and coal substantially contribute to the chronic respiratory disease burden (acute lower respiratory infection, chronic obstructive pulmonary disease). [52] Globally, solid fuels were estimated to account for 1.6 million excess deaths annually and 2.7% of disability-adjusted life years (DALYs) lost, of which, approximately 37% of this burden (DALYs) occurs in South Asia and estimated 400-550 thousands premature deaths just in India. [53],[54] The personal exposure to indoor air pollution can be substantially reduced with either replacing the fuel (replacement of wood, dung, crop residues, and coal for cooking and heating with kerosene and LPG) or by replacing the traditional stoves with improved stoves for burning traditional biomass fuels. A cost-effective analysis regarding the usage of above alternatives on health outcomes indicate that an improved biomass stove is the most cost-effective intervention for South Asia. [53]


   Examples from India Top


School-based interventions for health promotion

Several school-based health education in India [55],[56],[57] have successfully reduced the rates of both experimentation with tobacco and offer of tobacco by peers [Box 4].



Evidence from worksite interventions for health promotion

Alternative non-pharmacological approaches targeted to multiple risk factor reduction in non-randomized evaluations in Indian factory study showed promising results [Box 5]. [58]



Community mobilization program in India

Community-based awareness program like PACE Diabetes project in Chennai showed considerable benefits in terms of promoting health education for healthy diets, increasing physical activity, and screening for diabetes prevention and control [Box 6]. [59]



Quality improvement program in secondary prevention

Evidence from a Quality Improvement Programme (QIP) carried out at secondary healthcare setting in Kerala involving the use of a service delivery package and formal education, in the detection and optimal management of ACS for healthcare professionals, has shown estimable results and can be replicated. [60] Improvements in evidence-based treatment practices were observed after the comprehensive QIP. The Time to Thrombolysis (TTT) dropped significantly (median difference of 54 minutes, P<0.05) after the intervention program. Additionally, when TTT was stratified into different groups, 52.1% of STEMI patients received thrombolysis within the first 2 hours of the onset of symptoms in the post-intervention group as compared with 45.3% in the pre-intervention group. Such a significant reduction in TTT has the potential to improve clinical outcomes in patients with ACS. [60] The methods used to implement this program are readily available and could be easily implemented in any similar hospital and community setting.


   What is Needed for Public Health Interventions Top


At the macro-policy level, the need to identify NCD prevention as part of the primary health care package should be recognized and given due priority alongside reproductive and nutritional health and communicable diseases.

NCD prevention should be seen as being synergistic with poverty reduction strategies, and addressed in development initiatives. Policy initiative should aim to integrate NCDs with communicable disease, reproductive health and population control programs in an attempt to create cost- and time-effective opportunities for prevention. [61] Policy change with respect to NCD must include relevant areas in the domains of food and nutrition, tobacco, agro-industrial diversification, urban planning, education, and rural development. [3],[12],[62] Policies should ensure the availability of effective drugs, devices, and procedures at affordable prices to be used in a cost-effective manner. Policy issues regarding tobacco should be dealt at two stages. Initial priorities should focus on goals that are realistically achievable in the short to medium term, such as imposing bans on advertising and sale to minors, displaying statutory warnings on labels, and legislation to ban smoking in public places and transport utilities. Subsequently, major issues should be addressed such as agro-industrial diversification favoring tobacco substitution and transnational marketing of tobacco, which may affect pricing, production, and taxation [Box 7]. [63]



Multi-sectoral coordination approach

Prevention of NCD requires multi-sectoral co-ordination to provide an "enabling" environment which help people to make and maintain healthy choices. Many sectors, other than the traditional health sector, like agriculture, urban development, and education, need to work in concert to address the multiple determinants of NCDs through multi-sectoral pathways. Furthermore, setting up a suitable institutional mechanism to enable active partnership of multiple government ministries such as health, finance, excise, and taxes, home, education, agriculture, civil supplies, food processing, urban and rural development and panchayat raj, information and communication and participation of civil society organizations, private healthcare sector, media, donor organizations, and corporate is equally important to devise policies and programs which will find wide acceptability, an essential criterion for successful implementation.

In order to effectively coordinate these multiple stakeholders, the health ministry, both at central and state levels, would require a cadre of public health professionals (epidemiologists, health economists, health-management specialists, nutritionists) who can assist with developing evidence-based NCD polices, cost-effective NCD programs, and facilitate monitoring and evaluation of such policies and programs. Health impact assessment, of proposed policies and programs in other sectors which may influence the determinants of NCDs, should be prospectively undertaken. [64]


   Conclusion Top


Interventions influencing multiple risk determinants (both behavioral and biological risk factors) to prevent or reduce the NCD risk include: (a) policy interventions (related to tobacco control, alcohol reduction, production and supply of healthy foods, regulation of unhealthy foods, and urban planning which promotes physical activity); these have benefits for all the major NCDs; (b) empowerment of communities through health promotion programs (which enhance knowledge, motivation and skills in turn foster awareness and adoption of healthy behaviors); (c) early detection of individuals at high risk (due to modest elevations of multiple risk factors or marked elevation of a single risk factor) and effective interventions to decrease those risks (by reducing blood pressure, blood cholesterol, blood glucose, overweight and promoting tobacco cessation, physical activity, and healthy diets); (d) secondary prevention in persons who have developed CVD (by using similar measures and employing effective drugs with proven survival benefits, such as aspirin, beta blockers, ACE inhibitors, statins, diuretics and blood sugar lowering oral drugs or insulin), preventative screenings for cancer prevention and replacement of solid fuel with LPG to prevent COPD due to indoor air pollution.

Community empowerment is crucial for the success of all such programs and partnerships among different stakeholders are required to provide effective pathways for the design and delivery of NCD prevention and control programs. The limited resources available for health programs amidst competing priorities in India, necessitates the adoption of a "stepwise approach" to prevention as recommended by the WHO. [12] This approach is practical and should be undertaken in phased and progressive manner for implementation of sequentially prioritized measures.


   Contributions of authors Top


K. S. Reddy and D. Prabhakaran developed the concept of this paper. K Singh compiled the literature and wrote the first draft of this paper. All authors contributed further and modified the paper.

 
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