Table 1.
Sample characteristics stratified on low and high follow-up (2009) AM T (n = 624)
| All (n = 624) | Low AM T* (n = 316) | High AM T* (n = 308) | ||
| Mean ± SD | Mean ± SD | Mean ± SD | P value | |
| Demographic characteristics† | ||||
| Age, y | 26.0 ± 0.3 | 26.0 ± 0.3 | 26.0 ± 0.3 | 0.57 |
| Highest grade completed | 11.5 ± 4.8 | 11.2 ± 4.8 | 11.9 ± 4.8 | 0.07 |
| T values | ||||
| AM T 2005, pg/mL | 192.8 ± 74.1 | 175.5 ± 65.7 | 210.5 ± 77.9 | 0.0001 |
| AM T 2009, pg/mL‡ | 162.0 ± 61.8 | 115.9 ± 30.8 | 209.2 ± 48.4 | 0.0001 |
| PM T 2005, pg/mL | 117.7 ± 51.9 | 112.3 ± 50.0 | 123.3 ± 53.2 | 0.0001 |
| PM T 2009, pg/mL‡ | 92.6 ± 39.2 | 79.3 ± 32.4 | 106.2 ± 40.9 | 0.0001 |
| Anthropometric measures† | ||||
| Body fat percentage | 20.1 ± 5.2 | 19.9 ± 5.3 | 20.2 ± 5.1 | 0.40 |
| Body mass index, kg/m2 | 22.7 ± 3.6 | 22.5 ± 3.8 | 22.9 ± 3.4 | 0.23 |
| Relationship characteristics§ | ||||
| Partnered 2005 | 19.7% | 20.6% | 18.8% | 0.59 |
| Partnered 2009 | 54.0% | 59.8% | 48.1% | 0.003 |
| Duration of relationship¶, y | 3.7 ± 2.4 | 3.6 ± 2.4 | 3.8 ± 2.4 | 0.45 |
| Fatherhood characteristics | ||||
| Father 2005 | 16.0% | 15.8% | 16.2% | 0.89 |
| Father 2009 | 50.0% | 56.0% | 43.8% | 0.002 |
| No. children∥ | 1.6 ± 0.8 | 1.6 ± 0.8 | 1.7 ± 0.8 | 0.18 |
| Age of oldest child∥, y | 3.4 ± 2.2 | 3.2 ± 2.2 | 3.6 ± 2.2 | 0.16 |
*Test for significant differences by median split of 2009 AM T (low AM T < 155.6 pg/mL < high AM T); unpaired, two-tailed t test or χ2 test.
†2009.
‡Paired t tests comparing 2005 and 2009 AM and PM T (both P < 0.0001).
§Married/cohabitating.
¶Restricted to partnered men in 2009 (n = 337).
∥Restricted to fathers in 2009 (n = 312).