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Table 1 Percent agreement, Cohen’s kappa and intra-class correlation coefficient (ICC) for re-absracted data elements

From: Data accuracy in the Ontario birth Registry: a chart re-abstraction study

Data Element

Coding

Matched n/927 (%)

Kappa (κ) (%)

95% CI

ICC (%)

95% CI

SITE ID

Maternal chart ID

Baby chart ID

 1. Episiotomyd

None

Medio-lateral

Midline

Medial

Unknown

847 (91.4)

0.67

0.61–0.73

  

 2. Diabetes and Pregnancy (17 possible pick list choices - MSb)

Yes

No

Unknown

855 (92.2)

0.79

0.72–0.86

  

 3. Intention to breastfeed

Yes

No

757 (81.7)

0.30

0.22–0.37

  

 4. Newborn feeding at discharge

Formula only

Combination

Breastmilk only

Not applicable

Other

Unknown

706 (76.2)

0.68

0.64–0.73

  

 5. Newborn discharged or transferred tod

Home

Child and family services apprehension

Transfer to NICU/SCN other hospital

Transfer to NICU/SCN same hospital

Transfer to pediatric unit

859 (92.7)

0.46

0.25–0.68

  

 6. Hypertension during pregnancy

None

Eclampsia

Gestational hypertension

HELLP

Preeclampsia

Pre-existing hypertension with superimposed preeclampsia

Unknown

893 (96.3)

0.58

0.46–0.70

  

 7. Group B Strep screening results

Done, negative result

Done, positive result

Result unknown

Urine positive for GBS

Not done

Unknown if screened

739 (79.7)

0.75

0.71–0.79

  

 8. Group B Strep screening not done reasona

Declined screening

Other

Previous baby with GBS disease

Urine positive for GBS

880 (94.9)

    

 9. Labour typed

Spontaneous

Induced

No labour

908 (98)

0.61

0.57–0.65

  

 10. Mother resides with cigarette smoker at time of prenatal visit

Yes

No

Unknown

914 (98.6)

0.68

0.64–0.71

  

 11. Mother resides with cigarette smoker at time of labour /admission

Yes

No

Unknown

780 (84.1)

0.67

0.64–0.71

  

 12. Maternal cigarette smoking at prenatal visit

None

<10 /day

10-20 /day

>20/day

Unknown

835 (90.1)

0.56

0.49–0.62

  

 13. Maternal cigarette smoking at time of labourd

None

<10 /day

10-20 /day

>20/day

Unknown

726 (78.3)

0.58

0.50–0.65

  

 14. Type of birthd

Spontaneous vaginal

Assisted vaginal

Induced or spontaneous labour CS

No labour CS

876 (94.5)

0.89

0.79–1.00

  

 15. Indications for caesarean section (28 possible pick list choices – MSb)d

Yes

No

901 (97.2)

0.92

0.89–0.95

  

 16. Maternal Health Conditions (79 possible pick list choices – MSb)

Yes

No

916 (98.8)

0.75

0.61–0.89

  

 17. Complications of Pregnancy (24 possible pick list choices – MSb)

Yes

No

918 (99)

0.79

0.65–0.92

  

 18. Pain relief measures during newborn screening or serum bilirubin

Breastfeeding

Skin to Skin

Sucrose

Other

None

Unknown

834 (90)

0.50

0.41–0.59

  

 19. Labour and birth complications (21 possible pick list choices – MSb)

Yes

No

913 (98.5)

0.88

0.81–0.94

  

 20. Indications for induction of labour (23 possible pick list choices – MSb)d

Yes

No

851 (91.8)

0.76

0.70–0.80

  

 21. Fetal surveillanced

Admission EFM strip

Auscultation

Intrapartum EFM (external)

Intrapartum EFM (internal)

No monitoring

Unknown

922 (99.5)

0.95

0.91–0.99

  

 22. Number of fetusesd

Number (0–8)

Unknown

925 (99.8)

  

0.90

0.89–0.91

 23. Number of previous cesarean births c, d

Number (0–6)

Unknown

909 (98.1)

  

0.63

0.59–0.67

 24. Maternal pre-pregnancy weight

Weight

887 (95.7)

  

0.82

0.79–0.84

 25. Maternal height

Height

925 (99.8)

  

0.54

0.50–0.59

 26. Maternal weight at end of pregnancy

Weight

924 (99.7)

  

0.49

0.44–0.55

 27. Estimated date of birth

DD-MM-YYY

605 (65.3)

    

 28. Date of birth

DD-MM-YYY

877 (94.6)

    

 29. Gestational age at birthc, d

Weeks

771 (83.2)

    

Gestational age at birthc

Days

527 (56.9)

    
  1. Notes: aThe cell sizes across the response options were too small to run kappas.
  2. bMS Multiselect
  3. cUnable to report ICCs due to lack of convergance of algorithm
  4. dData elements evaluated in the Niday Perinatal Database Re-abstraction Study [24]
  5. Cohen’s kappa statistic (κ) - degrees of agreement after chance agreement has been excluded [36]: Poor < 0; Slight = 0–0.20; Fair = 0.21–0.40; Moderate = 0.41–0.60; Substantial = 0.61–0.80; Almost perfect = 0.81–0.99
  6. Intra-class correlation coefficient (ICC) [38]: Poor < 0.50; Moderate = 0.50–0.75; Good = > 0.75–0.90; Excellent > 0.90