Lower levels of UV exposure are associated with lower risk of acne

A multicenter retrospective cohort study was conducted with 19,939 students from five Chinese universities. Acquire environmental UV wavelengths exposed 6 years prior to study enrollment from individuals' home addresses. A logistic model was used to evaluate the relationship between environmental UV exposure and acne. Subgroup analyzes were performed by sunscreen behavior and duration of daily sun exposure, and the effects of exposure to different UV wavelengths (305 nm, 310 nm, 324 nm, and 380 nm) were assessed by Bayesian kernel machine regression.

As a result, analyzes of all participants showed a significant association between log-transformed levels of UV exposure at 305 nm (log(UV 305 nm)) and acne. The magnitude of the effect was stronger in participants who reported no sunscreen habit. Both 305nm and 310nm UV were associated with reduced acne risk in participants who reported no sunscreen habit. This inverse correlation was also observed in those exposed to low levels of UV (less than 1 hour per day). Bayesian kernel machine regression showed consistent results that lower levels of UV exposure were associated with reduced risk of acne.

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