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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).