Association and interaction between triglyceride–glucose index and obesity on risk of hypertension in middle-aged and elderly adults

Aims: To investigate the association between triglyceride–glucose(TyG) index and the risk of hypertension. Method: A cross-sectional study was conducted in Bengbu, China. The participants received relevant questionnaire survey, anthropometric tests, and laboratory examination. Multivariate logistic regression analysis was performed to estimate the possible association between TyG index and hypertension risk. The additive interaction evaluated by the relative excess risk due to interaction (RERI), attributable proportion due to interaction (AP), and synergy index(SI) was calculated. Results: A total of 1777 participants (748 men and 1029 women) were investigated. There was a significant increase in the risk of hypertension and isolated systolic hypertension (ISH) when comparing the highest TyG index (the fourth quartile) to the lowest TyG index (the first quartile) and corresponding ORs were 2.446 (95% CI: 1.746–3.426) and 2.621(95%CI: 1.627–4.224), respectively. However, no significant relationship was observed between TyG index and isolated diastolic hypertension (IDH). In males, significant interactions between TyG index and WHtR (RERI:1.978, 95%CI: 0.162–3.792; AP: 0.359, 0.113–0.605; SI:1.782, 1.017–3.122), smoking (AP: 0.437, 95%CI: 0.048–0.825), family history of hypertension (AP:0.433, 95%CI: 0.203–0.662; SI:2.248, 95%CI: 1.333–3.791) were observed. As for females, there were also significant interactions between TyG index and WHtR (RERI:1.415, 95%CI: 0.693–2.136; AP: 0.198, 95%CI: 0.104–0.291; SI:1.298, 95%CI:1.101–1.530), family history of hypertension (RERI:1.744, 95%CI: 0.221–3.267; AP:0.405, 95%CI: 0.113–0.697) on risk of hypertension. Conclusions: Increased TyG index was significantly associated with higher risk of hypertension and ISH, but not for IDH in middle-aged and elderly adults. Our results also demonstrated interactions of TyG index and abdominal obesity and family history of hypertension on hypertension risk.