Table 1.

Baseline characteristics of prostate cancer cases and controls, Health Professionals Follow-Up Study, 1993

	Cases (n=690)	Controls (n=692)
Age at blood draw (years, mean ± SD)a	65.7 ± 7.4	65.7 ± 7.4
Family history of prostate cancer (%)	20	14
Body mass index (kg/m2, %)
<25	62	60
25–29	33	33
≥30	5	7
Cigarette smoking status (%)
Never smoker	44	44
Former smoker	46	48
Current smoker	6	5
Missing	4	3
Alcohol intake (g/day, mean ± SD)	11.4 ± 14.9	10.3 ± 14.7
Prostate specific antigen concentration (ng/mL, mean ± SD)b	11.6 ± 21	Not applicable
Stage (%)b
T1b-T3a	72
T3b, T4, N1, M1 or prostate cancer death	14	Not applicable
Missing	14
Gleason sum (%)b
<7	58
≥7	34	Not applicable
Missing	8

SD = standard deviation

^amatching factor

^bn=501