Table 1.
Baseline Characteristics of Randomized WISER Participants (n = 318)
| Exercisers n = 165 | Controls n = 153 | |
|---|---|---|
| Demographics | ||
| Age, years (mean ± SE) | 25.4 ± 0.3 | 25.2 ± 0.3 |
| Not Married or Partnered (n, %) | 137 (83%) | 124 (81%) |
| Education beyond High School (n, %) | 157 (95.2%) | 148 (96.7%) |
| Caucasian (n, %) | 123 (75%) | 107 (70%) |
| Body Composition (mean ± SE) | ||
| Weight (kg) | 67.5 ± 1.1 | 67.6 ± 1.2 |
| BMI (kg/m2) | 24.8 ± 0.4 | 24.7 ± 0.4 |
| % Body Fat | 36.4 ± 0.7 | 36.1 ± 0.7 |
| Fat Mass (kg) | 24.3 ± 0.9 | 24.1 ± 0.9 |
| Lean Mass (kg) | 39.8 ± 0.4 | 40.1 ± 0.4 |
| Reproductive Characteristics | ||
| Age at Menarche, years (mean ± SE) a | 12.7 ± 0.12 | 12.7 ± 0.11 |
| Nulliparous (n, %) | 153 (93%) | 144 (94%) |
| Previous Contraceptive Use (n, %) | 84 (51%) | 82 (54%) |
| Family History of Breast Cancer b | ||
| No (n, %) | 129 (96%) | 114 (97%) |
| Physical Activity, Fitness & Diet (mean ± SE) | ||
| Moderate Exercise (MET-hrs/wk) | 1902 ± 421 | 1933 ± 525 |
| Aerobic Fitness (METs at 85% max HR) | 21.9 ± 1.3 | 21.8 ± 1.4 |
| Total calorie intake (kcal/day) c | 6.9 ± 0.1 | 7.1 ± 0.1 |
Note: There were no significant differences at baseline between study groups for any of these variables
a
n = 310,
b
n = 251,
c
n = 312