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Our study was conducted in Chennai, the capital city of the southern state of Tamil Nadu. Tamil Nadu has the sixth highest life expectancy among all Indian states (72.1) and was ranked as having the ninth highest health index—a composite measure made up of 23 health and health service indicators—by the government of India.19 20 Chennai is the most populous city within the state and the sixth most populous city in India (2011 population of 4.7 million individuals).21 Chennai has a relatively old age distribution within India: 53% is older than age 30% and 20% older than 50. Hinduism is the most common religion in Chennai (82%), followed by Islam (9%) and Christianity (8%).22

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