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Table 6 Validity of common categorical variables from newborn charts (n = 1,142)

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)
Mother information     
 Mother’s date of birth (Completed)c 99.3 100.0 (-) - 99.3 (98.6 – 99.7)
Newborn information     
 Date of birth (Yes)c 100 100.0 (-) - 100.0 (-)
 Sex     
  Female 51.7 99.9 (99.2 –100.0) 99.7 (98.9 –100.0) 99.7 (98.9 –100.0)
  Male 48.1 99.7 (98.9 –100.0) 99.5 (98.6 – 99.9) 99.5 (98.5 – 99.9)
Number of births in pregnancy     
  1 94.9 100.0 (-) 100.0 (-) 100.0 (-)
  2 5.1 100.0 (-) 100.0 (-) 100.0 (-)
 Stillbirth timing     
  N/A (live birth) 98.5 100.0 (-) 100.0 (-) 100.0 (-)
  Prior to onset of labour 0.5 85.3 (26.6 –100.0) 99.7 (99.2 – 99.9) 59.8 (14.5 – 94.6)
  After onset of labour 0 - 99.9 (99.4 –100.0) -
  Unknown time of stillbirth 0.9 53.2 (d) 99.9 (99.5 –100.0) 86.2 (d)
 Meconium present 18.3 76.9 (62.4 – 87.8) 97.6 (96.5 – 98.5) 87.9 (81.9 – 92.5)
 Suction - Oropharynx 18.8 58.7 (40.6 – 75.1) 97.4 (93.9 – 99.2) 84.1 (76.3 – 90.2)
 Resuscitative drugs 1.6 64.5 (48.8 – 78.2) 99.8 (99.3 –100.0) 81.7 (65.8 – 92.3)
 Resuscitation - Oxygen 12.9 74.8 (61.4 – 85.5) 99.3 (98.6 – 99.8) 94.3 (86.7 – 98.3)
 Breastfeeding initiation     
  0 to ≤1h 45.7 70.9 (61.6 – 79.0) 80.9 (72.9 – 87.3) 75.7 (69.4 – 81.3)
  >1 to ≤24h 42.6 52.6 (28.7 – 75.7) 81.8 (77.8 – 85.4) 68.2 (61.9 – 74.0)
  >24h 2.9 18.1 (6.8 – 35.7) 98.8 (98.0 – 99.4) 31.7 (20.2 – 45.1)
  Unknown 4.1 46.9 (31.0 – 63.3) 82.9 (55.1 – 97.0) 10.4 (5.6 – 17.4)
  N/A (did not breastfeed, died, or stillborn) 4.8 68.1 (60.2 – 75.3) 98.7 (97.8 – 99.3) 73.1 (63.8 – 81.1)
 Newborn feeding     
  Breast milk 63.4 90.7 (87.9 – 93.0) 78.8 (74.7 – 82.5) 88.1 (85.2 – 90.7)
  Formula 2.4 59.6 (42.9 – 74.8) 98.8 (97.9 – 99.3) 55.0 (41.0 – 68.4)
  Breast milk & formula 30.6 72.7 (67.4 – 77.7) 90.5 (88.1 – 92.5) 77.1 (72.6 – 81.2)
  Unknown 2.3 75.8 (67.0 – 83.3) 100.0 (99.6 –100.0) 98.2 (90.2 –100.0)
  N/A (transferred to another hospital, died, or stillborn) 1.2 73.4 (d) 99.5 (98.9 – 99.8) 63.1 (51.4 – 73.8)
 Discharge to     
  Home 95.5 99.7 (99.1 –100.0) 94.6 (82.6 – 99.2) 99.7 (99.1 –100.0)
  Other Hospital 2.3 100.0 (-) 100.0 (-) 100.0 (-)
  Adoption 0 100.0 (-) 99.8 (99.3 –100.0) 3.0 (d)
  Foster 0.6 69.2 (29.6 – 94.7) 100.0 (99.6 –100.0) 90.4 (59.9 – 99.6)
  Death/Stillbirth 1.5 100.0 (-) 100.0 (-) 100.0 (-)
  Unknown 0.1 - 100.0 (-) -
  1. aPrevalence and measures of validity based on weighted data
  2. bPrevalence based on re-abstraction
  3. cVariables were dichotomized (completed/missing); completed values were assumed to be equal
  4. d95 % confidence interval not estimable