Table 1.
Characteristica |
Regular exercise | |||||
---|---|---|---|---|---|---|
No exercise (N=975) |
All categories (N=1,286) |
<20 MET- hrs/wk (N=503) |
20–39 MET- hrs/wk (N=489) |
≥40 MET- hrs/wk (N=294) |
P-trendb | |
Age, years (mean) | 36.8 | 37.1 | 37.3 | 36.9 | 37.2 | 0.84 |
White (%) | 90.3 | 92.2 | 89.4 | 95.1 | 92.6 | 0.01 |
Body mass index, kg/m2 (mean) | 25.0 | 23.2 | 23.4 | 22.9 | 23.1 | <0.001 |
Education (%) | ||||||
Less than College | 36.5 | 19.5 | 18.5 | 18.5 | 22.6 | <0.001 |
College | 36.1 | 35.6 | 34.8 | 35.7 | 36.2 | 0.97 |
Graduate school | 27.4 | 44.9 | 46.6 | 45.8 | 41.2 | <0.001 |
Multivitamin use (%) | 39.1 | 50.7 | 50.0 | 48.8 | 54.0 | <0.001 |
Current smoker (%) | 16.4 | 5.2 | 5.2 | 4.4 | 6.5 | <0.001 |
Pack-years of smoking (mean) | 5.0 | 2.2 | 2.6 | 1.9 | 1.9 | <0.001 |
Alcohol, g/wk (mean) | 66.0 | 66.7 | 60.9 | 70.7 | 69.2 | 0.30 |
Caffeine, mg/wk (mean) | 1,970 | 1,702 | 1,694 | 1,674 | 1,771 | 0.003 |
Diabetes treated with medication (%) | 1.0 | 0.9 | 0.5 | 0.6 | 1.6 | <0.001 |
Hypertension (%) | 10.5 | 5.6 | 5.2 | 7.0 | 2.9 | <0.001 |
History of urogenital anomaly (%) | 9.6 | 11.6 | 13.5 | 12.8 | 7.3 | 0.96 |
History of STD/prostate infection (%) | 13.7 | 13.3 | 12.8 | 14.9 | 11.0 | 0.62 |
History of male factor infertility (%) | 27.0 | 25.8 | 26.5 | 27.3 | 22.6 | 0.24 |
IVF or GIFT before entering study (%) | 14.3 | 12.5 | 14.1 | 12.0 | 11.1 | 0.08 |
Wear briefs only (%) | 56.5 | 49.6 | 52.1 | 50.6 | 43.3 | <0.001 |
Baths preferred to showers (%) | 3.3 | 2.0 | 1.8 | 1.2 | 4.2 | 0.41 |
N = number of male participants.
Characteristics are presented as means or percents within exercise categories and are standardized to age distribution of sample.
Test of difference in baseline characteristic across physical activity categories (none, <20, 20–39, ≥40 MET-hrs/wk).