Table 2 Summary statistics of the study population
Variables | Women who gave birth | Women who gave birth and had a tocolytic hospitalization | Excluded population |
|---|---|---|---|
Individual factors | Â | Â | Â |
   Age (S.D.) | 28.22 (4.9) | 29.12 (5.3) | 29.27 (5.9) |
   Wage (S.D.) | 17,202.93 (16,325.7) | 18,393.48 (17,256.6) | 18,215.43 (16,957.2) |
   Having a major disease card (%) | 25,719 (1.3%) | 1,733 (2.1%) | 2,006 (1.9%) |
   Having hospitalizations for preterm labor before (%) | 71,876 (3.6%) | 31,935 (38.2%) | 18,897 (18.2%) |
   Previous year's inpatient expenses (S.D.) | 3,637.16 (14198.1) | 3,968.92 (14444.2) | 3,789.52 (14264.86) |
Observations | 1,979,311 | 83,619 | 64,098 |