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Table 6 Agreement between linked and self-reported data by participant characteristics

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

Participants' characteristics N Agreement N (%) Disagreement N (%) % Total agreement Kappa (95% CI)
Both yes Both no SR yes LD no SR no LD yes
Age        
16-35 158 16 (10.1) 125 (79.1) 5 (3.2) 12 (7.6) 89.2 0.59 (0.42, 0.77)
36-50 715 64 (9.0) 590 (82.5) 26 (3.6) 35 (4.9) 91.5 0.63 (0.54, 0.71)
51+ 583 38 (6.5) 472 (81.0) 38 (6.5) 35 (6.0) 87.5 0.44 (0.33, 0.55)
Gender        
Male 1069 93 (8.7) 865 (80.9) 49 (4.6) 62 (5.8) 89.6 0.57 (0.49, 0.64)
Female 387 25 (6.5) 322 (83.2) 20 (5.2) 20 (5.2) 89.7 0.50 (0.36, 0.63)
Ethnicity        
Maori 46 3 (6.5) 40 (87.0) 1 (2.2) 2 (4.4) 93.5 0.63 (0.25, 1.00)
Non-Maori 1410 115 (8.2) 1147 (81.4) 68 (4.8) 80 (5.7) 89.5 0.55 (0.48, 0.61)
Level of education        
High school (secondary) or less 240 13 (5.4) 193 (80.4) 15 (6.3) 19 (7.9) 85.8 0.35 (0.18, 0.52)
Polytechnic 370 31 (8.4) 305 (82.4) 14 (3.8) 20 (5.4) 90.8 0.59 (0.47, 0.72)
University 846 74 (8.8) 689 (81.4) 40 (4.7) 43 (5.1) 90.2 0.58 (0.50, 0.66)
NZDep 2006 scores*        
1-3 752 61 (8.1) 600 (79.8) 43 (5.7) 48 (6.4) 87.9 0.50 (0.41, 0.59)
4-7 516 44 (8.5) 426 (82.6) 19 (3.7) 27 (5.2) 91.1 0.61 (0.50, 0.71)
8-10 174 13 (7.5) 149 (85.6) 6 (3.5) 6 (3.5) 93.1 0.65 (0.46, 0.83)
Urbanity of residence        
Main urban area 1165 98 (8.4) 943 (80.9) 58 (5.0) 66 (5.7) 89.4 0.55 (0.48, 0.62)
Others 277 20 (7.2) 232 (83.8) 10 (3.6) 15 (5.4) 91.0 0.56 (0.41, 0.72)
Region of residence        
Auckland 531 37 (7.0) 431 (81.2) 30 (5.7) 33 (6.2) 88.1 0.47 (0.36, 0.58)
Wellington 313 27 (8.6) 251 (80.2) 14 (4.5) 21 (6.7) 88.8 0.54 (0.41, 0.68)
Others 598 54 (9.0) 493 (82.4) 24 (4.0) 27 (4.5) 91.5 0.63 (0.54, 0.72)
Pre-existing medical condition ƚ        
Yes 296 23 (7.8) 237 (80.1) 21 (7.1) 15 (5.1) 87.8 0.49 (0.35, 0.63)
No 1160 95 (8.2) 950 (81.9) 48 (4.1) 67 (5.8) 90.1 0.57 (0.50, 0.64)
Hours spent cycling a week        
0-2 237 12 (5.0) 212 (89.5) 3 (1.3) 10 (4.2) 94.5 0.62 (0.43, 0.81)
3-5 552 47 (8.5) 444 (80.4) 31 (5.6) 30 (5.4) 88.9 0.54 (0.44, 0.64)
6+ 667 59 (8.8) 531 (79.6) 35 (5.2) 42 (6.3) 88.5 0.54 (0.45, 0.63)
Confidence of reporting having crashes        
Sure or very sure 1413 117 (8.3) 1150 (81.4) 68 (4.8) 78 (5.5) 89.7 0.56 (0.49, 0.62)
Others 43 1 (2.3) 37 (86.1) 1 (2.3) 4 (9.3) 88.4 0.23 (−0.20, 0.68)
  1. * 2006 New Zealand Deprivation Index with decile ten the most deprived neighbourhood and decile one the least.
  2. ƚ Heart attack, stroke, cancer, diabetes or high blood pressure.
  3. SR, Self-reports; LD, Linked Data.