Table 3.

Odds ratios and 95% confidence intervals of baseline serum 25-hydroxy vitamin D and bladder cancer risk stratified by selected potential effect modifiers, ATBC study

	Serum 25-hydroxy Vitamin D (nmol/L)
	< 50		≥ 50
Subgroup	# cases/# controls	OR (95% CI)	# cases/# controls	OR (95% CI)	p for interaction
Season of blood collection
Darker	125/115	1.40 (0.78 – 2.50)	25/32	1.0 (ref)
Sunnier	73/56	2.28 (1.27 – 4.11)	27/47	1.0 (ref)	0.24
Physically active
No	158/140	1.65 (1.05 – 2.60)	45/65	1.0 (ref)
Yes	40/31	2.62 (0.94 – 7.30)	7/14	1.0 (ref)	0.41
α-Tocopherol supplementation
No	106/72	2.36 (1.34 – 4.18)	27/43	1.0 (ref)
Yes	92/99	1.35 (0.75 – 2.46)	25/36	1.0 (ref)	0.18
Time from blood collection to case diagnosis
< 10 years	96/89	2.59 (1.38 – 4.85)	33/40	1.0 (ref)
≥10 years	102/82	1.33 (0.77 – 2.30)	19/39	1.0 (ref)	0.11

^*Unconditional models adjusted for matching factors (age and date of baseline blood draw).