Table 3.
Number of Children Born, Number of Pregnancies and Age of First Pregnancy, By Twin Type and Sample
| Australian | Dutch | US | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Mean | (SD) | N | Mean | (SD) | N | Mean | (SD) | N | |
| Number of children born | |||||||||
| Females from SS pairs | 2.89 | (1.83) | 323 | 2.29 | (1.43) | 137 | 2.48 | (1.77) | 1519 |
| Females from OS pairs | 3.01 | (1.64) | 153 | 2.63 | (1.83) | 57 | 2.51 | (1.73) | 703 |
| Total number of pregnancies | |||||||||
| Females from SS pairs | 3.27 | (1.97) | 315 | ||||||
| Females from OS pairs | 3.34 | (1.86) | 151 | ||||||
| Age at first pregnancy | |||||||||
| Females from SS pairs | 24.43 | (4.45) | 282 | 25.76 | (4.27) | 119 | |||
| Females from OS pairs | 25.01 | (4.11) | 139 | 25.16 | (4.69) | 48 | |||
Note: The Ns refer to the number of women for whom data were available for each measure. Differences between Ns arise because some women chose not to answer some questions. For the Australian sample the number of pregnancies was corrected for multiple births, still births, miscarriages and terminations.