Table 1.

Distributions of Baseline Characteristics and Their Associations With the Incidence of Benign Prostatic Hyperplasia, Prostate Cancer Prevention Trial, 1993–2003

	No. of Subjects	%	No. of BPH Events	Person-Years of Follow-up	Incidence Ratea
Total	4,735	100	471	25,365	18.6
Age, years
55–59	1,706	36	110	9,411	11.7
60–64	1,497	32	150	8,018	18.7
65–69	1,532	32	211	7,936	26.6
Race/ethnicity
White	4,371	92	427	23,646	18.1
Black	175	4	20	828	24.2
Hispanic	115	2	13	571	22.8
Other	74	2	11	320	34.4
Smoking statusb
Current smoker	397	8	41	2,034	20.2
Former/never smoker	4,337	92	430	23,325	18.4
Body mass indexc
Normal (<25)	1,177	25	117	6,421	18.2
Overweight (25–29.9)	2,470	52	250	13,214	18.9
Obese (≥30)	1,088	23	104	5,730	18.1
Physical activityb
Sedentary	766	16	76	4,043	18.8
Light activity	2,021	43	195	10,793	18.1
Moderate activity	1,453	31	143	7,906	18.1
Very active	470	10	54	2,517	21.5
Baseline I-PSS
0.0–3.9	2,385	50	119	13,155	9.0
4.0–5.9	1,349	28	158	7,234	21.0
6.0–7.0	1,001	21	194	4,976	39.0

Abbreviations: BPH, benign prostatic hyperplasia; I-PSS, International Prostate Symptom Score.

^a Number of cases per 1,000 person-years.

^b For smoking and physical activity, numbers of participants, BPH events, and person-years do not sum to the totals because of missing data.

^c Weight (kg)/height (m)².