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Table 5 Agreement between linked and self-reported data

From: Completeness and accuracy of crash outcome data in a cohort of cyclists: a validation study

 

Agreement N (%)

Disagreement N (%)

% Total agreement

Kappa (95% CI)

Sensitivity (95% CI)

Specificity (95% CI)

PPV (95% CI)

NPV (95% CI)

Both yes

Both no

SR yes LD no

SR no LD yes

All crashes

          

At least one crash claimed to ACC

114 (7.8)

1201 (82.5)

59 (4.1)

82 (5.6)

90.3

0.56 (0.50, 0.63)

65.9 (58.3, 72.8)

93.6 (92.1, 94.9)

58.2 (50.9, 65.1)

95.3 (94.0, 96.4)

At least one crash requiring overnight hospital admission

10 (0.7)

1415 (97.8)

18 (1.3)

12 (0.2)

98.5

0.47 (0.28, 0.66)

34.5 (18.6, 54.3)

99.8 (99.3, 100.0)

76.9 (50.0, 93.8)

98.7 (97.9, 99.2)

At least one crash requiring attention

118 (8.1)

1187 (81.5)

69 (4.7)

82 (5.6)

89.6

0.55 (0.49, 0.61)

63.1 (55.7, 69.9)

93.5 (92.0, 94.8)

59.0 (51.8, 65.8)

94.5 (93.1, 95.7)

Collisions with a motor vehicle

          

At least one collision claimed to ACC

20 (1.4)

1412 (97.0)

21 (1.4)

3 (0.2)

98.4

0.62 (0.48, 0.76)

48.8 (33.2, 64.6)

99.8 (99.3, 100.0)

87.0 (65.3, 96.6)

98.5 (97.7, 99.1)

At least one collision requiring overnight hospital admission

2 (0.1)

1443 (99.1)

8 (0.6)

3 (0.2)

99.3

0.26 (−0.03, 0.56)

20.0 (3.5, 55.8)

99.8 (99.3, 100.0)

40.0 (7.3, 83.0)

99.5 (99.0, 99.7)

At least one collision reported to police

10 (0.7)

1412 (97.0)

34 (2.3)

0 (0.0)

97.7

0.36 (0.20, 0.53)

22.7 (12.0, 38.2)

100.0 (99.7, 100.0)

100.0 (65.6, 100.0)

97.7 (96.7, 98.3)

At least one collision requiring attention

22 (1.5)

1399 (96.1)

33 (2.3)

2 (0.1)

97.6

0.55 (0.41, 0.68)

40.0 (27.3, 54.1)

99.9 (99.4, 100.0)

91.7 (71.5, 98.5)

97.7 (96.7, 98.4)

  1. SR, Self-reports; LD, Linked Data.