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Table 4 Validity of selected mandatory and other common categorical variables from maternal charts (n = 1,084d)

From: Validating the British Columbia Perinatal Data Registry: a chart re-abstraction study

Variable name Prevalencea,b Sensitivity (95 % CI)a Specificity (95 % CI)a Positive predictive value (95 % CI)
Antenatal info     
 Maternal date of birth (Completed)c 100.0 100.0 (-) - 100.0 (-)
 Last menstrual period date (Completed)c 73.9 84.4 (81.6 – 87.0) 78.3 (72.1 – 83.6) 91.7 (89.4 – 93.6)
 First ultrasound date (Completed)c 83.5 83.9 (78.9 – 88.2) 93.8 (89.4 – 96.7) 98.6 (97.4 – 99.3)
  In vitro fertilization (Yes) 3.3 77.5 (61.4 – 89.2) 98.7 (97.0 – 99.6) 67.3 (43.5 – 86.0)
  Smoking status (current) 10.7 63.9 (55.6 – 71.6) 98.2 (97.1 – 99.0) 81.3 (70.1 – 89.6)
  Maternal serum screening offered (Yes) 81.3 91.4 (88.6 – 93.8) 80.9 (72.5 – 87.6) 95.4 (92.7 – 97.3)
  Hepatitis B screening completed (Yes) 95.0 98.2 (97.2 – 98.9) 64.0 (51.1 – 75.5) 98.1 (96.7 – 99.0)
   Positive 0.7 51.1 (18.1 – 83.4) 99.8 (99.4 –100.0) 70.7 (31.1 – 95.2)
  Group B Strep screening completed (Yes) 83.6 93.0 (91.1 – 94.7) 70.7 (63.3 – 77.4) 94.2 (91.7 – 96.1)
   Positive 23.8 91.1 (81.9 – 96.6) 97.8 (95.3 – 99.2) 92.8 (86.6 – 96.8)
  HIV screening completed (Yes) 94.3 98.0 (97.0 – 98.8) 72.3 (60.8 – 81.9) 98.3 (97.3 – 99.0)
Labour and delivery information     
  Vaginal birth after cesarean delivery (VBAC) eligible 9.2 74.2 (63.4 – 83.2) 98.0 (96.9 – 98.8) 79.1 (68.7 – 87.3)
  VBAC attempted 4.7 85.1 (64.4 – 96.3) 100.0 (99.6 –100.0) 100.0 (90.9 –100.0)
  Labour type - Spontaneous 59.9 97.9 (96.4 – 98.8) 94.4 (91.2 – 96.7) 96.3 (94.6 – 97.6)
  Labour type - Augmented 35.9 81.8 (75.9 – 86.8) 93.5 (90.9 – 95.6) 87.7 (83.2 – 91.3)
  Labour type - Induced 23.3 93.9 (90.2 – 96.5) 98.7 (97.7 – 99.3) 95.5 (92.4 – 97.7)
  Labour type - None 16.9 94.0 (89.9 – 96.8) 99.5 (98.8 – 99.8) 97.3 (94.0 – 99.1)
  Primary indication for induction     
   Post dates 6.3 87.1 (76.2 – 94.3) 99.0 (97.3 – 99.8) 85.7 (70.9 – 94.8)
   Pre-labour rupture of membranes 5.7 90.7 (76.2 – 97.8) 98.7 (97.8 – 99.3) 80.9 (69.8 – 89.4)
   Fetal compromise 2.0 40.1 (22.4 – 59.8) 99.2 (98.5 – 99.6) 50.1 (29.3 – 71.0)
   Other maternal condition 2.7 28.9 (8.5 – 58.7) 99.5 (98.5 – 99.9) 63.1 (18.2 – 95.0)
   Logistics 0.1 100.0 (-) 100.0 (-) 100.0 (-)
   Fetal demise 0.2 100.0 (-) 100.0 (-) 100.0 (-)
   Hypertension in pregnancy 3.1 73.2 (59.2 – 84.6) 100.0 (99.6 –100.0) 99.0 (89.3 –100.0)
   Antepartum hemorrhage 0.2 14.1 (0.0 – 90.4) 100.0 (-) 100.0 (-)
   Diabetes 0.8 94.7 (63.7 –100.0) 99.6 (99.0 – 99.9) 65.3 (37.1 – 87.3)
   Other 1.6 83.2 (59.2 – 96.1) 98.3 (97.3 – 99.0) 44.6 (27.6 – 62.6)
   Unknown 0.4 - 99.7 (98.5 –100.0) -
  Delivery presentation     
   Breech/NOS 3.3 62.8 (47.9 – 76.2) 98.9 (98.1 – 99.4) 66.3 (51.7 – 78.9)
   Frank breech 0.7 62.8 (30.1 – 88.6) 99.6 (99.0 – 99.9) 51.1 (20.8 – 80.8)
   Footling breech 1.3 70.0 (38.2 – 91.8) 99.6 (99.0 – 99.9) 71.4 (49.0 – 88.1)
   Complete breech 0.2 - 99.9 (99.4 –100.0) -
   Incomplete breech 0.0 - 99.9 (99.4 –100.0) -
   Vertex 89.8 98.0 (96.8 – 98.8) 65.7 (51.5 – 78.1) 96.2 (92.5 – 98.4)
   Transverse 1.1 54.0 (26.3 – 80.0) 99.6 (98.6 – 99.9) 57.9 (27.3 – 84.6)
   Other 0.0 - 100.0 (-) -
   Unknown 3.5 13.7 (4.7 – 29.0) 98.5 (96.3 – 99.6) 25.4 (9.5 – 48.2)
  Primary indication for operative delivery     
   Breech 3.0 75.4 (58.5 – 88.0) 99.9 (99.5 –100.0) 95.3 (83.1 – 99.5)
   Dystocia/CPD 7.3 50.9 (40.7 – 61.0) 99.6 (99.0 – 99.9) 90.5 (80.7 – 96.4)
   Nonreassuring Fetal Heart Rate 5.9 85.9 (76.3 – 92.7) 98.7 (97.6 – 99.4) 81.1 (71.0 – 88.9)
   Repeat Cesarean Section 4.4 79.3 (64.6 – 89.9) 95.2 (92.5 – 97.1) 43.0 (25.6 – 61.7)
   Abruptio Placenta 0.3 87.3 (e) 99.9 (99.5 –100.0) 74.0 (27.0 – 98.1)
   Placenta Previa 0.9 94.4 (69.6 – 99.9) 100.0 (99.6 –100.0) 96.3 (69.5 –100.0)
   Malposition/Malpresentation 1.8 67.3 (42.4 – 86.6) 98.4 (97.4 – 99.0) 42.7 (20.2 – 67.7)
   Active Herpes 0.0 100.0 (-) 100.0 (-) 100.0 (-)
   VBAC Declined/Maternal Request 5.4 36.4 (17.6 – 58.8) 99.0 (98.3 – 99.5) 68.4 (48.6 – 84.3)
   Unknown 0.0 - 99.8 (99.4 –100.0) -
   Other 6.8 71.5 (60.3 – 81.2) 96.7 (95.0 – 98.0) 61.7 (43.4 – 77.8)
  Cesarean delivery type     
   Primary Elective 3.5 96.0 (83.8 – 99.7) 99.8 (99.4 –100.0) 95.3 (82.3 – 99.6)
   Primary Emergency 17.7 99.1 (97.1 – 99.8) 99.8 (99.2 –100.0) 99.2 (97.3 – 99.9)
   Repeat Elective 7.3 94.9 (86.7 – 98.8) 99.2 (98.0 – 99.8) 90.7 (76.0 – 97.9)
   Repeat Emergency 7.3 90.2 (78.9 – 96.7) 99.6 (99.0 – 99.9) 94.7 (87.9 – 98.3)
  Baby delivery date (Completed)c 100.0 100.0 (-) - 100.0 (-)
  Baby delivery time (Completed)c 100.0 100.0 (-) - 100.0 (99.6 –100.0)
  Delivery provider (Delivered by)d,e     
   Family Physician 33.6 82.9 (67.0 – 93.2) 96.2 (93.6 – 98.0) 91.8 (86.9 – 95.3)
   Obstetrician 46.3 96.9 (95.2 – 98.2) 89.6 (85.6 – 92.8) 88.9 (84.9 – 92.2)
   Surgeon 0.9 100.0 (-) 100.0 (-) 100.0 (-)
   Midwife 9.0 97.4 (92.6 – 99.4) 99.4 (98.8 – 99.8) 94.5 (88.8 – 97.9)
   Nurse 2.5 64.9 (35.7 – 87.6) 99.8 (99.3 –100.0) 89.4 (61.7 – 99.3)
  Rh immunoglobulin postpartum eligible (Yes) 7.2 89.6 (80.5 – 95.4) 99.8 (99.3 –100.0) 97.0 (89.8 – 99.6)
  Postpartum infection (Yes) 0.9 65.3 (37.1 – 87.3) 99.2 (98.4 – 99.6) 40.8 (21.4 – 62.6)
  1. aPrevalence and measures of validity based on weighted data
  2. bPrevalence based on re-abstraction
  3. cVariable was dichotomized (completed/missing); completed values were assumed to be equal
  4. dMulti-fetal pregnancies included one record per baby delivered (n = 1,129)
  5. e95 % CI not estimable