Table 1 Baseline characteristics of study participants
Study | Age | Parity | Ethnicity | Gestational Age |
|---|---|---|---|---|
Jamie et al. (2004, United States) [11] | 25.0 ± 5.5 years | 57% parous (reported as dichotomous) | African American 29% Hispanic 8% White 58% Other 4.5% | 35.4 ± 3.1 weeks |
Trappe et al. (2011, United States) [12] | 26.4 ± 5.6 years | 71.5% parous (reported as mean 1.5 with standard deviation of 1.5, despite variable being discrete) | African American 24% Hispanic 22.9% Non-Hispanic White 48.7% Asian 1% Other 1.9% | 35.9 ± 0.7 weeks |
Huang et al. (2019, Switzerland) [19] | 32.7 ± 4.6 years | Reported as mean 1 with standard deviation of 1, despite variable being discrete | (Sub)continent of origin • Europe 78.0% • Asia 10.4% • North America 2.0% • Africa 2.0% • Middle East 2.0% • South America 1.6% • Unknown 4.0% | 35–37 weeks (mean and variance not reported) |