Table 1.
Sample characteristics for pre- and post-menopausal Tsimane women
| Pre-menopausal (n = 86) |
Post-menopausal (n = 44) |
|||||||
|---|---|---|---|---|---|---|---|---|
| Parameter | Mean | SD | Min. | Max. | Mean | SD | Min. | Max. |
| Age (years) | 27.3 | 8.5 | 15 | 44 | 54.7** | 9.7 | 41 | 75 |
| Height (cm) | 150.8 | 5.0 | 139.6 | 169.8 | 149.7 | 3.9 | 142.5 | 160.0 |
| Weight (kg) | 55.2 | 9.3 | 31.9 | 90.1 | 53.2 | 8.9 | 33.0 | 74.5 |
| Body fat (%) | 27.0 | 7.1 | 11.2 | 40.1 | 27.8 | 7.2 | 11.7 | 43.3 |
| Fat mass (kg) | 15.6 | 6.2 | 5.2 | 33.0 | 15.3 | 6.0 | 4.7 | 32.3 |
| Fat-free mass (kg) | 40.5 | 4.3 | 32.8 | 57.1 | 37.8** | 4.1 | 27.8 | 47.1 |
| Nulliparous (1=yes, 0=no) | 0.23 | ----- | ----- | ----- | 0.00** | ----- | ----- | ----- |
| Cycling (1=yes, 0=no) | 0.66 | ----- | ----- | ----- | ----- | ----- | ----- | ----- |
| Lactating (1=yes, 0=no) | 0.22 | ----- | ----- | ----- | ----- | ----- | ----- | ----- |
| Pregnant (1=yes, 0=no) | 0.12 | ----- | ----- | ----- | ----- | ----- | ----- | ----- |
| Number of births | 3.6 | 3.3 | 0 | 13 | 9.7** | 3.7 | 1 | 15 |
| Mean IBI (months) | 30.9 | 11.9 | 11.8 | 76.0 | 30.4 | 9.9 | 10.5 | 56.0 |
| Age at first birth (years) | 18.0 | 2.5 | 14 | 26 | 18.5 | 3.1 | 14 | 27 |
| Estimated calcaneal BMD (g/cm2) | 0.46 | 0.08 | 0.32 | 0.71 | 0.40** | 0.09 | 0.24 | 0.63 |
**
p < 0.01 compared to pre-menopausal women (t-test, Mann-Whitney U test, or χ2 test)
Abbreviations: IBI: inter-birth interval; BMD: bone mineral density