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Table 2 Summary statistics of the study population

From: Factors associated with tocolytic hospitalizations in Taiwan: evidence from a population-based and longitudinal study from 1997 to 2004

Variables Women who gave birth Women who gave birth and had a tocolytic hospitalization Excluded population
Individual factors    
   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