[A case-control study on the relations between insulin resistance and essential hypertension in YI NATIONALITY living in Liangshan, Sichuang Province].

Objective: To determine whether insulin resistance (IR) was associated with essential hypertension (EH) in YI nationality living in Liangshan, Sichuang Province.

Methods: A case-control study consisting of 113 YI hypertensives as cases and 156 YI normotensives as controls were conducted to investigate the level of fasting glucose (FG) and fasting insulin (FINS), and insulin resistance index was used as the indicator of IR.

Results: It was found that impaired fasting glucose (IFG) and IR were associated with EH significantly among YI migrants, and OR (95% CI) were 3.98 (2.14 approximately 7.42, P < 0.001) and 2.55 (1.35 approximately 4.83, P = 0.004) respectively. Being stratified by sex, both IFG and IR were associated with EH significantly among YI male migrant, and OR were 4.31 (2.01 approximately 9.24, P < 0.001) and 3.14 (1.45 approximately 6.82, P = 0.003) respectively; but only IFG was associated with EH significantly among YI female migrant and OR was 3.46 (1.17 approximately 10.22, P = 0.022). Among YI farmers, both IFG and IR were not associated with EH significantly. The non-conditional logistic regression analysis showed that IR was associated significantly with EH among YI migrants. This was not as same as observed in YI farmers.

Conclusion: It is likely that IR is the risk factor of EH among YI migrants in our study. However, the association between IR and EH among YI farmers needs some further studies.