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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