Prevalence of and factors associated with hypertension among the hill tribe population aged 35 years and over in northern Thailand: a cross-sectional study.

backgroundHypertension (HT) is a serious noncommunicable disease that can lead to several health problems when it is not detected or is not properly diagnosed and treated in a timely manner, particularly in individuals living in poor economic and education conditions. The hill tribe population in northern Thailand is a vulnerable population with limited information available regarding HT.

methodsThe study aimed to estimate the prevalence of HT and to determine the factors associated with HT among individuals from hill tribes aged 35 years and over and living in northern Thailand. A cross-sectional study was conducted to gather essential information from six main hill tribe groups: the Akha, Lahu, Karen, Hmong, Yao and Lisu tribes in Chiang Rai Province. A simple random method was used to select 30 hill tribe villages (5 villages for each tribe). People aged 35 years and over who lived in the selected villages were invited to participate in the study. A validated questionnaire and a 5-mL blood specimen were used as research instruments. A face-to-face interview was conducted to collect data after informed consent was obtained, and 5-mL blood specimens were drawn to determine the lipid profiles of the participants. Logistic regression was performed to determine the factors associated with HT at the significance level of α = 0.05.

resultsA total of 1,287 participants were recruited into the study: 60.5% were females, 30.4% were aged 35-44 years, 65.4% were illiterate, and 83.1% were married. The overall prevalence of HT was 24.3%, and the Yao tribe had the highest prevalence at 18.5%. In the multivariable analysis, three variables were found to be associated with HT: marital status, ability to read Thai, and exercise behavior. Those who were single and divorced had a 2.55 (95% CI = 1.23-5.06) and 2.69 times greater chance (95% CI = 1.10-6.59), respectively, of developing HT than those who were married. Those who could not read Thai had a 2.13 times greater chance (95% CI = 1.50-3.01) of developing HT than those who could read, and those who did not exercise and who exercised sometimes had a 1.96 (95% CI = 1.07-3.58) and 2.24 times greater chance (95% CI = 1.21-4.13), respectively, of developing HT than those who regularly exercised.

conclusionA health screening program for the identification of new HT among the hill tribe population urgently needs to be implemented, followed by the introduction of a proper exercise program to reduce the risk of HT, particularly for those who are illiterate and for single or divorced people.