Age, Sex, and BMI in Case Group, Control Group, and Total Study Population
| Characteristic | Case group | Control group | Overall group | P case/control | P case/overall |
| Age (y) | 37.9 ± 17.1 | 37.9 ± 17.0 | 59.7 ± 14.9 | 0.846 | <0.001 |
| Sex (female:male) | 54:27 | 54:27 | 707:856 | 1.000 | <0.001 |
| BMI (kg/m2) | 22.7 ± 4.4 | 22.8 ± 4.9 | — | 0.884 | — |
Data are mean ± SE. Significance of group differences was calculated by 2-sided t tests. BMI was not assessed in total population.