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Table 2 Inter-rater reliability for symptoms, diagnostic procedures, treatment and stroke subtype

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

 

N

Obs.agr. (%)a

Kappa (95 % CI)

AC1 (95 % CI)

Symptoms at admission

 Hemiparesis face

108

79.6

0.64 (0.51–0.77)

0.72 (0.61–0.83)

 Hemiparesis legs

110

73.6

0.54 (0.41–0.68)

0.63 (0.51–0.75)

 Hemiparesis arms

109

80.0

0.62 (0.49–0.75)

0.73 (0.62–0.83)

 Speech problems

107

72.9

0.52 (0.37–0.66)

0.62 (0.50–0.75)

 Other focal symptoms

111

62.2

0.37 (0.22–0.53)

0.46 (0.33–0.59)

 Symptoms at right/left side

111

79.3

0.69 (0.58–0.79)

0.73 (0.64–0.84)

 Level of consciousnessb

109

95.8

0.66 (0.47–0.85)

0.93 (0.89–0.98)

Diagnostic imaging and examinations

 CT/MRI <24 h after admission

110

97.3

0.69 (0.39–0.99)

0.97 (0.94–1.00)

 Imaging of the stroke

109

87.2

0.77 (0.66–0.87)

0.84 (0.76–0.92)

 Imaging of intracranial vessels

110

91.0

0.56 (0.33–0.79)

0.90 (0.85–0.96)

 Imaging of extracranial vessels

110

83.6

0.71 (0.59–0.83)

0.82 (0.74–0.90)

 Imaging of the heart

111

89.2

0.68 (0.52–0.85)

0.88 (0.82–0.95)

 Heart rate monitoring

111

52.2

0.17 (0.03–0.31)

0.46 (0.35–0.57)

Treatment and diagnosis

 Anticoagulants as treatment

111

88.3

0.34 (0.04–0.60)

0.87 (0.80–0.94)

 Anticoagulants as prophylaxis

111

86.5

0.56 (0.36–0.76)

0.84 (0.76–0.92)

 Swallowing test performed

111

48.6

0.19 (0.09–0.30)

0.27 (0.12–0.43)

 Mobilized out of bed <24 h

110

21.8

0.04 (0.00–0.09)

−0.11 (0.00–0.01)

 Stroke subtype

111

99.1

0.97 (0.90–1.00)

0.99 (0.97–1.00)

  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