Selection of subjects: All the available subjects at the
time of survey in selected households were covered for
personal profile, anthropometry, clinical examination
and history of current morbidity. 24 h recall method
of diet survey was carried out in one fourth of HHs
covered for anthropometry using systematic random
sampling procedure. All men and women ≥20 yr of
age were covered for blood pressure measurement
and information on knowledge and treatment practices
about hypertension and diabetes.
Sample size: an earlier study revealed that the overall
prevalence of hypertension among the rural men and
women (≥20 yr) was about 10 per cent12. Therefore,
assuming the prevalence of hypertension among tribal
population as 10 per cent, with 95% confidence interval
and 20 per cent relative precision, with design effect of
2, the sample size required for each gender was 1729
(1730) in each state.
Knowledge & treatment practices about hypertension:
Information on knowledge and treatment practices
and risk behaviours was collected from all those
men and women covered for measurement of blood
pressure using pre-tested and validated questionnaire
interviews.