Table 1.
Characteristics of the study population, women aged 18 to 21 years and aged 31 to 40 years.
| Ages 18 to 21 (n = 180) | Ages 31 to 40 (n = 148) | |||
|---|---|---|---|---|
| Mean (SD) | Range | Mean (SD) | Range | |
| IGF-1 (ng/ml) | 315.4 (104.1) | 94.0 - 620.0 | 174.4 (56.7) | 33.0 - 314.0 |
| Age (years) | 19.7 (1.1) | 18 - 21 | 35.3 (3.1) | 31 - 40 |
| BMI (kg/m2) | 23.3 (4.2) | 17.5 - 48.9 | 25.6 (5.5) | 17.4 - 50.8 |
| Height (cm) | 162.8 (6.9) | 146.0 - 183.0 | 162.7 (5.7) | 145.0 - 175.0 |
| Weight (kg) | 62.0 (13.7) | 44.6 - 139.6 | 67.9 (15.0) | 44.0 - 135.1 |
| Days since last period | 16.7 (9.7) | 1.0 - 41.0 | 15.9 (8.9) | 1.0 - 35.0 |
| Ethnicity n(%) | ||||
| European | 69 (39) | 97 (65) | ||
| East Asian | 56 (31) | 11 (7) | ||
| South Asian | 17 (10) | 7 (5) | ||
| Other/Mixeda | 37 (21) | 34 (23) | ||
| Parous n(%) | 0 (0) | 36 (24) | ||
| OC use n(%) | ||||
| Never | 100 (56) | 37 (25) | ||
| Past | 29 (16) | 88 (59) | ||
| Current | 51 (28) | 24 (16) | ||
| Ever physical activity n(%)b | ||||
| Childhood | 169 (94) | 127 (85) | ||
| Teenage | 149 (83) | 118 (79) | ||
| Current | 129 (72) | 126 (85) | ||
a Includes African, Caribbean, Middle Eastern, First Nation, Latin American; b Doing physical activity at least once per week