Table 1.

Characteristics of the prostate cancer cases and matched controls from the CPS-II Nutrition Cohort

Controls (N = 272)Cases (N = 272)
VariableN (%)N (%)
Age at blood draw
 ≤6551 (18.7)50 (18.3)
 66–7090 (33.1)90 (33.1)
 71–7577 (28.3)81 (29.8)
 76+54 (19.9)51 (18.8)
Race
 White271 (99.6)271 (99.6)
 Black1 (0.4)1 (0.4)
Family history of prostate cancera
 Yes31 (11.4)50 (18.4)
Diabetesb
 Yes33 (12.1)27 (9.9)
BMI (kg/m2)b
 <25112 (41.2)101 (37.1)
 25–<30108 (39.7)128 (47.1)
 30+47 (17.3)41 (15.1)
 Missing5 (1.8)2 (0.7)
Physical activity (METs/wk)a
 <776 (27.9)75 (27.6)
 7–<17.5108 (39.7)112 (41.2)
 17.5–<24.538 (14.0)48 (17.7)
 24.5+48 (17.7)34 (12.5)
 Missing2 (0.7)3 (1.1)
History of PSA testinga
 Never24 (8.8)40 (14.7)
 Within 2 years192 (70.6)180 (66.2)
 >2 years30 (11.0)28 (10.3)
 Unknown26 (9.6)24 (8.8)
Gleason score
 6 or 7 (3+4)27 (9.9)
 7 (4+3)108 (39.7)
 873 (26.8)
 9–1046 (16.9)
 Unknown18 (6.6)
Stagec
 T2 (organ confined)194 (71.3)
 T344 (16.2)
 T425 (9.2)
 Unknown9 (3.3)

Abbreviations: BMI, body mass index; METs, metabolic equivalents.

  • aAs reported on 1997 questionnaire.

  • bAs reported at time of blood draw (1998–2001).

  • cUnknown category includes six cases defined as regional using SEER summary stage that corresponds to stage T3 or T4.