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Table 1 Summary statistics of singleton deliveries and antenatal hospitalizations, 1997-2004

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

Year Number of Singleton deliveries Total number of antenatal hospitalizations Total number of tocolytic hospitalizations Number of excluded cases
1997 302,049 13,341 9,145 8,814
1998 246,244 12,236 9,816 8,262
1999 257,326 12,441 10,217 9,025
2000 276,786 13,311 11,567 8,890
2001 239,626 13,205 10,682 7,644
2002 232,192 13,149 10,862 7,495
2003 216,390 13,310 10,732 6,609
2004 208,698 12,318 10,598 7,359
Total 1,979,311 103,811 83,619 64,098
  1. The exclusion population include: (1) women hospitalized for early pregnancy loss (ICD-9-CM 630-634 and 637-639) or elective termination (ICD-9-CM 635 and 636); (2) women aged above 50 or below 15; (3) women whose attending obstetrician/gynecologist's age was below 25 or above 75; (4) women with multiple deliveries (ICD-9-CM 651-652); (5) hypertension/eclampsia/pre-eclampsia (ICD-9-CM 642); (6) excessive maternal bleeding/abrupted placenta/placenta previa (ICD-9-CM 762.0, 762.1, 762.2); (7) premature rupture of membrances/incompetent cervix (ICD-9-CM 761); (8) fetal distress (ICD-9-CM 656.3, 663.0, 768.3 and 768.4) (9) maternal infection/chorioamnionitis (ICD-9-CM 762.7); and (10) congenital abnormalities (ICD-9-CM 740-759).