Table 1.

Selected characteristics of 563 study participants

CharacteristicParticipants, N = 563
n (%)
Age at enrollment (y)
    55-5996 (16.8)
    60-64192 (33.7)
    65-69180 (31.6)
    70-7495 (16.7)
Education level
    Less than high school46 (8.1)
    Completed high school99 (17.4)
    Some college or vocational training191 (33.5)
    Completed college and above227 (39.8)
Family history of prostate cancer
    No524 (92.1)
    Yes31 (5.4)
Cigarette smoking status
    Never215 (37.7)
    Former293 (51.4)
    Current55 (9.6)
Body mass index
    Normal (18.5-24.9)145 (25.6)
    Overweight (25-29.9)288 (50.8)
    Obese (≥30)127 (22.4)
Serum markerMeanSDRange
Total testosterone (nmol/L)17.78.60.6-60.0
Bioavailable testosterone (nmol/L)4.91.90.2-14.5
4-Androstene-3,17-dione (androstenedione; ng/dL)126.144.329.6-301.6
5α-Androstane-3α,17β-diol glucuronide (3αdiol G; ng/dL)828.6585.667.6-5,346.7
SHBG (nmol/L)48.722.913.1-152.3