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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.