Table 2.
Characteristics of the SFF and MGH study populations
| SFF N=425 |
MGH N=425 |
Total N=850 |
|
|---|---|---|---|
| Mean (SD) | |||
| Age (years) | 32.2 (6.2) | 36 (5.3) | 34.3 (6.1) |
| BMI (kg/m2) | 28.2 (5.4) | 28 (4.5) | 28.1 (4.9) |
| Percent of men | |||
| Current smoker | 21 | 9 | 15 |
| White, non Hispanic | 72.3 | 85 | 79 |
| Sperm concentration < 20 ×106/mL | 7.8 | 15.3 | 12 |
| Sperm motility (A+B) < 50% | 37.4 | 45.9 | 42 |
| Made a partner pregnanta | 100 | 41.6 | 71 |
| Had trouble fathering a childb | 4.3 | 100 | 52 |
SFF: Study for Future Families
MGH: Massachusetts General Hospital
SD: Standard deviation
a
In SFF, all men were partners of pregnant women. In MGH, this is the percent of men who self-reported that they had ‘ever made a partner pregnant’
b
In MGH, all men were in a couple seeking evaluation or treatment for infertility. In SFF this is the percent of men who responded positively to the question: ‘Have you ever seen a doctor because you thought you might be having trouble fathering a child?’