Skip to main content

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