Table 4 Sample Construction
Criteria | # of Observations |
|---|---|
Starting sample | 236,820 births |
1.Keep only if MONTHS_SINCE_LAST_LIVE_BIRTHÂ =Â 0 or is missing (no prior births) or BIRTH==1 | 97,171 births |
2. Drop Cesarean births where fetal malpresentation is not indicator | 75,021 births |
3. Keep mothers age 18+ at first birth | 69,875 births |
4. Keep only births delivered between 28 and 42Â weeks of gestation | 67,480 births |
5. Keep only singleton births | 66,674 births |
6.Keep mothers for whom we observe both first and second births | 58,926 births |
7. Final Analytic Sample (mothers with 2 births) | 29,463 mothers |