Table 1 Sexual Behavior and PSA Concentrations among US Men (Age 40 – 59), NHANES 2001 – 2004
Variable | n | Predicted margin geometric mean PSA (ng/ml) | p-value | Predicted margin percent free PSA | p-value |
|---|---|---|---|---|---|
Age at first intercourse (years) | 1185 | ||||
≤ 15 | 400 | 0.80 (0.73 to 0.89) | Reference | 30.3 (28.6 to 32.0) | Reference |
16 – 18 | 476 | 0.81(0.76 to 0.87) | 0.833 | 31.1 (29.5 to 32.6) | 0.561 |
≥ 19 | 309 | 0.82 (0.75 to 0.90) | 0.802 | 31.3 (29.6 to 32.9) | 0.417 |
Number of lifetime sexual partners | 1169 | ||||
0 – 3 | 268 | 0.83 (0.76 to 0.91) | Reference | 31.0 (29.2 to 32.7) | Reference |
4 – 5 | 181 | 0.94 (0.84 to 1.05) | 0.072 | 31.3 (29.1 to 33.6) | 0.820 |
6 – 10 | 268 | 0.73 (0.68 to 0.79) | 0.069 | 31.4 (29.4 to 33.4) | 0.783 |
11 – 20 | 193 | 0.91 (0.78 to 1.05) | 0.345 | 29.2 (26.6 to 31.7) | 0.317 |
20 + | 259 | 0.73 (0.66 to 0.80) | 0.072 | 31.4 (29.0 to 33.9) | 0.767 |
Number of sexual partners in the past year | 1190 | ||||
0 | 155 | 0.78 (0.68 to 0.88) | Reference | 30.5 (28.1 to 32.9) | Reference |
1 | 854 | 0.82 (0.78 to 0.87) | 0.471 | 31.1 (30.0 to 32.1) | 0.703 |
≥ 2 | 181 | 0.79 (0.69 to 0.90) | 0.916 | 30.3 (27.4 to 33.1) | 0.882 |
Number of sexual partners in the past 30 days* | 194 | ||||
0 | 29 | 0.76 (0.58 to 1.00) | Reference | 30.8 (25.6 to 36.1) | Reference |
1 | 95 | 0.77 (0.65 to 0.92) | 0.914 | 29.9 (27.1 to 32.6) | 0.734 |
≥ 2 | 70 | 0.88 (0.70 to 1.11) | 0.392 | 29.4 (24.1 to 34.7) | 0.696 |
Have you had sex without a condom in the past 30 days?† | 161 | ||||
Yes | 119 | 0.76 (0.66 to 0.88) | Reference | 30.8 (27.8 to 33.7) | Reference |
No | 42 | 1.15 (0.81 to 1.63) | 0.029 | 24.7 (19.0 to 30.3) | 0.031 |
Are you circumcised? | 1211 | ||||
Yes | 837 | 0.82 (0.77 to 0.86) | Reference | 31.1 (30.0 to 32.2) | Reference |
No | 374 | 0.80 (0.72 to 0.90) | 0.810 | 30.0 (27.3 to 32.7) | 0.348 |
Self-reported history of STD infection | 1182 | ||||
Yes | 77 | 0.85 (0.74 to 0.98) | 0.517 | 28.5 (25.2 to 32.0) | 0.151 |
No | 1105 | 0.81 (0.77 to 0.85) | Reference | 31.1 (30.1 to 32.1) | Reference |