Table 3.

Multivariate logistic regression analysis of sunscreen product usage frequency and acne.

Variable	n	Model 1a	Model 2b	Model 3c	Model 4d
Sunscreen product usage frequency
Never	202	1.00 (ref)	1.00 (ref)	1.00 (ref)	1.00 (ref)
Occasionally	43	1.942 (0.965, 3.907)	1.339 (0.593, 3.023)	1.202 (0.503, 2.869)	1.408 (0.521, 3.806)
Frequently	14	2.457 (0.812, 7.440)	1.600 (0.474, 5.397)	2.121 (0.554, 8.119)	2.338 (0.522, 10.47)
Daily	41	4.005 (1.982, 8.092)*	2.433 (1.056, 5.609)*	2.721 (1.082, 6.842)*	3.395 (1.153, 9.992)*

^aCrude model.

^bAdjusted for age, gender and BMI based on model 1.

^cFurther adjusted for nation, marital status, education level, health insurance, smoking status, alcohol intake, sleeptime, skintype based on model 2.

^dFurther adjusted for lifestyle, skincare habits and dietary habits based on model 3.

*mean p < 0.05.