The relationship between triglyceride (TG) level and the mortality risk of all-cause and cardiovascular disease is not entirely consistent among adults. The present analysis included adult participants from National Health and Nutrition Examination Surveys (NHANES) between the periods 1999–2014. The levels of TG were categorized into ?150, 150–199, 200–250 and?≥?250?mg/dL respectively. Multivariate Cox regression analysis, stratified analysis and generalized additive model were conducted to reveal the correlation between TG and mortality risk. Results were presented in hazard ratio (HRs) and 95% confidence intervals (CIs). There were 18,781 (9130 males, mean age was 45.64?years) participants being included in the analysis. The average follow-up period was 8.25?years, where 1992 (10.61%) cases of all-cause and 421 (2.24%) cardiovascular death have occurred. In the multivariate Cox model, every 1?mg/dL raise in TG has significantly associated with all-cause mortality (HR: 1.08, 95% CI: 1.02, 1.15) but not cardiovascular mortality (HR: 1.10, 95% CI: 0.97, 1.24). When using TG? 150?mg/dL as reference, TG?≥?250?mg/dL associated with death from all-cause (HR?=?1.34, 95% CI: 1.12, 1.60; P?=?0.0016 but not cardiovascular death (HR?=?1.26, 95% CI: 0.85, 1.88; P?=?0.2517). According to smoothing spline plots, the risk of all-cause was the lowest when TG was approximately 135?mg/dL. TG might have a dose-independent association with all-cause mortality among adults in United States.
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