Table 5.

Subgroup Analysis of Associations Between Tanning With Repeated Sun Exposure and the Risk of Cataract Surgery During the Follow-Up

	Weekend Outdoor Hours Per Day
	Moderately vs. Very	Mildly vs. Very	Never vs. Very		P for
Factors	Tanned HR (95% CI)	Tanned HR (95% CI)	Tanned HR (95% CI)	P for Trend	Interaction
Baseline age (y)					0.003
45–49	0.90 (0.77–1.06)	0.89 (0.73–1.09)	0.74 (0.55–1.00)	0.165
50–54	1.04 (0.94–1.16)	1.03 (0.90–1.18)	0.93 (0.77–1.14)	0.305
55–59	1.09 (1.01–1.18)a	1.11 (1.01–1.21)a	1.07 (0.93–1.22)	0.194
60–65	1.04 (0.98–1.11)	1.08 (1.00–1.16)a	1.11 (1.00–1.23)a	0.008
Sex					0.376
Male	1.07 (1.00–1.14)a	1.12 (1.03–1.21)a	1.04 (0.91–1.18)	0.075
Female	1.02 (0.96–1.08)	1.03 (0.96–1.11)	1.03 (0.94–1.13)	0.296
BMI					0.857
Normal	1.05 (0.98–1.13)	1.11 (1.02–1.21)a	1.09 (0.96–1.23)	0.127
Overweight	1.01 (0.95–1.09)	1.04 (0.95–1.13)	1.02 (0.90–1.15)	0.384
Obesity	1.07 (0.98–1.18)	1.06 (0.94–1.18)	1.04 (0.89–1.21)	0.511
Smoker (current + past)					0.225
Yes	0.98 (0.83–1.17)	1.06 (0.86–1.32)	0.85 (0.60–1.19)	0.921
No	1.05 (1.00–1.10)a	1.07 (1.01–1.13)a	1.06 (0.98–1.14)	0.056
Alcohol consumption per week					0.679
<14 drinks	1.04 (0.99–1.09)	1.07 (1.00–1.13)a	1.07 (0.98–1.17)	0.086
≥14 drinks	1.06 (0.97–1.15)	1.06 (0.96–1.17)	1.01 (0.89–1.16)	0.311
Physical activity (sessions/wk)					0.842
<5	1.00 (0.90–1.12)	1.08 (0.95–1.23)	1.07 (0.90–1.27)	0.209
≥5–9	1.02 (0.94–1.11)	1.05 (0.96–1.16)	1.05 (0.92–1.19)	0.361
≥9–14	1.06 (0.97–1.15)	1.04 (0.94–1.16)	0.97 (0.83–1.12)	0.979
≥14	1.08 (1.00–1.17)a	1.10 (0.99–1.21)	1.11 (0.96–1.27)	0.097

^aIndicates P value < 0.05.