Apple Women’s Health Study
The Apple Women’s Health Study is the first long-term research study of this scale and scope that aims to advance the understanding of menstrual cycles and their relationship to various health conditions.
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Understanding exercise patterns and heart rate throughout pregnancy – Data
More details about the information presented in the below tables are included in the study update on Exercise and heart rate changes during pregnancy.
Table 1: Demographic information. Some participants contributed more than one pregnancy to the analysis. ‘Other’ in race and ethnicity includes Middle Eastern or North African, American Indian or Alaska Native, Native Hawaiian or other Pacific Islander, None of these fully describe me.
| Demographic Variable | Median (Range) or n (%) |
| Subject count (N) | 733 |
| Pregnancy count | 757 |
| Age at pregnancy start in years, N=712 | 32 (20-45) |
| BMI at study start in kg/m2, N=729 | 26.3 (16.8-51.7) |
| Race and ethnicity (% by subject) | |
| White, non-Hispanic | 588 (80.2%) |
| Hispanic, Latina, Spanish and/or other Hispanic | 38 (5.2%) |
| Black or African American or African | 18 (2.5%) |
| Asian | 18 (2.5%) |
| Other | 8 (1.1%) |
| More than 1 race | 63 (8.6%) |
| Gestational age in weeks | 39w1d (24w5d-43w) |
| Gravidity (% by pregnancy) | |
| 1 | 260 (34.3%) |
| 2 | 208 (27.5%) |
| 3 | 154 (20.3%) |
| >3 | 127 (16.8%) |
| Missing | 8 (1.1%) |
| Parity (% by pregnancy) | |
| 1 | 399 (52.7%) |
| 2 | 227 (30.0%) |
| 3 | 87 (11.5%) |
| >3 | 36 (4.8%) |
| Missing | 8 (1.1%) |