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Table 1 Inter-rater reliability for medical history, functional status prior to stroke onset and pre-hospital data

From: Inter-rater reliability of a national acute stroke register

 

N

Obs.agr. (%)a

Kappa (95 % CI)

AC1 (95 % CI)

Past medical history

 Previous stroke

111

92.8

0.81 (0.69–0.94)

0.91 (0.85–0.97)

 Myocardial infarction

111

96.4

0.87 (0.75–0.99)

0.95 (0.90–1.00)

 Major cardiac interventions

111

92.8

0.66 (0.43–0.88)

0.92 (0.86–0.98)

 Atrial fibrillation

111

89.2

0.71 (0.56–0.86)

0.87 (0.79–0.94)

 Diabetes

109

97.2

0.92 (0.83–1.00)

0.96 (0.91–1.00)

 TIA (transient ischemic attack)

111

91.9

0.54 (0.27–0.81)

0.91 (0.85–0.97)

Drug treatment prior to stroke onset

 Aspirin (ASA)

110

97.3

0.94 (0.87–1.00)

0.95 (0.89–1.00)

 ADP receptor antagonist

110

98.2

0.74 (0.40–1.00)

0.98 (0.96–1.00)

 Dipyridamole

110

95.5

0.60 (0.28–0.92)

0.95 (0.91–0.99)

 Warfarin

111

98.2

0.93 (0.83–1.00)

0.98 (0.95–1.00)

 Diuretics

111

86.5

0.60 (0.42–0.78)

0.84 (0.76–0.92)

 ACE-inhibitor

110

98.2

0.91 (0.80–1.00)

0.98 (0.95–1.00)

 A2-receptor blocker

110

92.7

0.70 (0.52–0.89)

0.92 (0.86–0.98)

 Beta blocker

111

95.5

0.91 (0.82–0.99)

0.94 (0.90–0.99)

 Calcium channel blocker

109

94.5

0.74 (0.54–0.94)

0.94 (0.90–0.99)

 Statins

111

97.3

0.94 (0.87–1.00)

0.95 (0.90–1.00)

 Other drugs against hypertension

111

72.0

0.48 (0.34–0.61)

0.63 (0.51–0.74)

Functional status prior to stroke

 Housingb

110

98.2

0.88 (0.80–0.96)

0.97 (0.94–0.99)

 Functional mobilityb

104

98.1

0.83 (0.67–0.98)

0.98 (0.96–0.99)

 Marital status

111

75.7

0.62 (0.52–0.72)

0.69 (0.58–0.80)

 Living situation

106

91.0

0.84 (0.75–0.93)

0.89 (0.82–0.96)

 Toilet hygiene

111

88.3

0.44 (0.24–0.65)

0.87 (0.80–0.94)

 Dressing

111

87.4

0.55 (0.37–0.73)

0.85 (0.78–0.93)

On stroke onset

 Patient woke with stroke symptoms?

108

62.0

0.28 (0.11–0.44)

0.49 (0.35–0.62)

 Place of stroke onset

110

96.4

0.58 (0.21–0.96)

0.96 (0.92–1.00)

  1. aObserved agreement calculated as concordant answers divided by N
  2. bOrdinal data, estimate based on Cohen’s quadratic weighted kappa and Gwet’s AC2