Table 2.

Sun exposure and NHL in the NSW and SCALE case-control studies (3, 18)

Sun exposure	Exposure categories, OR (95% CI): NSW study					P_trend
Sun exposure		1st quarter	2nd quarter	3rd quarter	4th quarter	P_trend
Total exposure	1	0.72 (0.53-0.98)	0.66 (0.48-0.91)	0.65 (0.46-0.91)	0.01
Nonworking days exposure	1	0.83 (0.61-1.11)	0.57 (0.42-0.79)	0.47 (0.34-0.66)	0.0001
Working days exposure	1	0.98 (0.73-1.33)	0.91 (0.66-1.25)	0.95 (0.68-1.33)	0.68
Vacation exposure in warmer months*	1	0.78 (0.57-1.05)	0.81 (0.59-1.10)	0.65 (0.47-0.91)	0.02

Sun exposure	Exposure categories, OR (95% CI)					P_trend
SCALE study
	Never	<1/wk	2-3/wk	≥4/wk
Sunbathing at age 20	1	0.8 (0.7-0.9)	0.7 (0.6-0.9)	0.7 (0.6-0.9)	0.001
	Never	1-5	6-20	>20
Sunny vacations abroad	1	1.0 (0.9-1.1)	0.9 (0.8-1.0)	0.7 (0.6-0.8)	<0.001
	Never	<1/y	1/y	≥2/y
Sunburns at age 20	1	1.0 (0.9-1.2)	0.8 (0.7-0.9)	0.6 (0.5-0.8)	<0.001

NCI-SEER study
	<7	7-13	14-27	≥28
Hours per week in the midday sun in the last 10 y^†	1	0.85 (0.62-1.18)	0.75 (0.54-1.05)	0.73 (0.46-1.15)	0.07
	None	1	2-4	≥5
History of blistering sunburns	1	0.87 (0.62-1.23)	1.02 (0.72-1.46)	0.68 (0.47-0.97)	0.10

↵* Pattern for vacations in cooler months was similar but more consistently downwards and with a smaller P.
↵† Results were also presented for hours per week in the midday sun during teens, during twenties, and during thirties. The results were similar with ORs trending down to 0.75, 0.75, and 0.78 with ≥28 h of exposure, and Ps are somewhat higher.