The rates of diabetes and hypertension are high among middle-aged and elderly people across all geographic measures and sociodemographic groups in India, researchers found.
The study, led by researchers at Harvard TH Chan School of Public Health, also found unexpectedly high rates of hypertension among young adults.
"Understanding how diabetes and hypertension prevalence varies within a country as large as India is essential for targeting of prevention, screening, and treatment services," said Pascal Geldsetzer, lead author of the study published in the journal JAMA Internal Medicine.
Rates of noncommunicable diseases have risen in recent decades and are likely to continue as India's population ages and urbanises, they said.
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Meanwhile, many areas of India still face substantial burdens of infectious diseases and poor maternal and child health.
The researchers wanted to find out how the prevalence of diabetes and hypertension in India varied by state, rural vs urban location, and by sociodemographic characteristics such as education and household wealth.
They used health data collected from 1,320,555 adults across India between 2012 and 2014, which included plasma glucose and blood pressure measurements.
Overall, prevalence of diabetes was 6.1 per cent among women and 6.5 per cent among men; for hypertension, 20.0 per cent among women and 24.5 per cent among men.
Household wealth and urban location were positively associated with both conditions, and the prevalence of diabetes and hypertension among middle-aged adults in the poorest households in rural areas was also high (5.9 per cent had diabetes and 30 per cent had hypertension).
Hypertension was higher among adults under 45 than previously estimated and was higher than in Central and Eastern Europe, the region previously estimated to have the highest rates for young adults, researchers found.
"The potential for harnessing new technologies to reach the millions affected by these diseases and reverse the course of these epidemics is real.
"However, because the epidemics are worsening rapidly, now is the time for urgent action," said Atun.
Ashish Awasthi, faculty at the Indian Institute of Public Health in Gujarat said, "diagnosis of hypertension and diabetes is straightforward but mostly untapped due lack of awareness and regular medical checkups."