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Table 3 Comparison of two prenatal care utilization indices: Percent of singleton live births assigned to each category and percent of preterm, low birth weight, and small-for-gestational age births among live births in each category, Winnipeg, 1991–2000

From: Inadequate prenatal care and its association with adverse pregnancy outcomes: A comparison of indices

Index Categories Singleton live births Preterm Births Small-for-gestational-age (SGA) Low birth weight (LBW)
   No. (%) No. (%) No. (%) No. (%)
APNCU Index      
  Intensive 25 394 (31.4) 2 725 (10.7) 2 379 (9.4) 1 920 (7.6)
  Adequate 31 982 (39.5) 1 130 (3.5) 2 981 (9.3) 1 011 (3.2)
  Intermediate 16 937 (20.9) 463 (2.7) 1 717 (10.1) 494 (2.9)
  Inadequate 6 383 (7.9) 458 (7.2) 832 (13.0) 389 (6.1)
  No prenatal care 293 (0.4) 44 (15.0) 55 (18.8) 44 (15.0)
R-GINDEX      
  Intensive 10 192 (12.6) 326 (3.2) 929 (9.1) 255 (2.5)
  Adequate 33 453 (41.3) 2 951 (8.8) 3 134 (9.4) 2 201 (6.6)
  Intermediate 30 139 (37.2) 1 077 (3.6) 2 960 (9.8) 993 (3.3)
  Inadequate 6 912 (8.5) 422 (6.1) 886 (12.8) 365 (5.3)
  No prenatal care 293 (0.4) 44 (15.0) 55 (18.8) 44 (15.0)