Table 4.
Sensitivity, specificity, accuracy, positive and negative predictive values for each checklist question, across six of the questions and across the original nine questions
| Question | OA diagnosis | Se (95% CI) (%) | Sp (95% CI) (%) | Accuracy (95% CI) (%) | PPV (95% CI) (%) | NPV (95% CI) (%) | ||
|---|---|---|---|---|---|---|---|---|
| Yes | No | Total | ||||||
| Q1. Limp or stiff after exercise | 63.4 (56.0 to 70.4) | 88.8 (84.7 to 92.1) | 79.4 (75.6 to 82.9) | 76.8 (69.3 to 83.3) | 80.5 (75.9 to 84.6) | |||
| Yes | 116 | 35 | 151 | |||||
| No | 67 | 277 | 344 | |||||
| Total | 183 | 312 | 495 | |||||
| Q2. Signs of pain | 64.3 (56.9 to 71.2) | 86.5 (82.1 to 90.1) | 78.3 (74.3 to 81.8) | 73.6 (66.0 to 80.3) | 80.5 (75.8 to 84.6) | |||
| Yes | 117 | 42 | 159 | |||||
| No | 65 | 268 | 333 | |||||
| Total | 182 | 310 | 492 | |||||
| Q3. Reluctant to climb stairs or jump | 68.1 (60.9 to 74.8) | 84.6 (80.1 to 88.4) | 78.4 (74.5 to 82.0) | 72.4 (65.1 to 78.9) | 81.7 (77.0 to 85.7) | |||
| Yes | 126 | 48 | 174 | |||||
| No | 59 | 263 | 322 | |||||
| Total | 185 | 311 | 496 | |||||
| Q4. Difficulty in rising from resting position | 57.3 (49.8 to 64.5) | 86.7 (82.4 to 90.3) | 75.7 (71.6 to 79.4) | 72.1 (64.1 to 79.2) | 77.2 (72.4 to 81.5) | |||
| Yes | 106 | 41 | 147 | |||||
| No | 79 | 267 | 346 | |||||
| Total | 185 | 308 | 493 | |||||
| Q5. Change in dog behaviour | 40.9 (33.6 to 48.4) | 90.0 (86.1 to 93.1) | 71.8 (67.6 to 75.8) | 70.5 (60.8 to 79.0) | 72.2 (67.4 to 76.6) | |||
| Yes | 74 | 31 | 105 | |||||
| No | 107 | 278 | 385 | |||||
| Total | 181 | 309 | 490 | |||||
| Q6. Lag behind during walks | 54.9 (47.4 to 62.2) | 85.8 (81.4 to 89.5) | 74.3 (70.2 to 78.1) | 69.7 (61.5 to 77.0) | 76.2 (71.4 to 80.6) | |||
| Yes | 101 | 44 | 145 | |||||
| No | 83 | 266 | 349 | |||||
| Total | 184 | 310 | 494 | |||||
| Q7. Injured before | 35.9 (28.9 to 43.3) | 83.3 (78.7 to 87.3) | 65.7 (61.4 to 69.9) | 55.9 (46.5 to 65.1) | 68.8 (63.8 to 73.4) | |||
| Yes | 66 | 52 | 118 | |||||
| No | 118 | 260 | 378 | |||||
| Total | 184 | 312 | 496 | |||||
| Q8. Medication for pain | 39.1 (32.0 to 46.6) | 81.0 (76.1 to 85.2) | 65.4 (61.0 to 69.6) | 55.0 (46.0 to 63.7) | 69.1 (64.1 to 73.9) | |||
| Yes | 72 | 59 | 131 | |||||
| No | 112 | 251 | 363 | |||||
| Total | 184 | 310 | 494 | |||||
| Q9. Gained weight | 40.0 (32.9 to 47.4) | 62.7 (57.0 to 68.1) | 54.2 (49.6 to 58.6) | 39.2 (32.2 to 46.5) | 63.5 (57.8 to 68.9) | |||
| Yes | 74 | 115 | 189 | |||||
| No | 111 | 193 | 304 | |||||
| Total | 185 | 308 | 493 | |||||
| At least one of the first six questions (Q1 to Q6) was answered with a “yes” | 88.2 (82.6 to 92.4) | 70.5 (65.1 to 75.5) | 77.1 (73.2 to 80.7) | 64.1 (57.9 to 69.9) | 90.9 (86.6 to 94.2) | |||
| Yes | 164 | 92 | 256 | |||||
| No | 22 | 220 | 242 | |||||
| Total | 186 | 312 | 498 | |||||
| At least one of the nine questions (Q1 to Q9) were answered with a “yes” | 98.9 (96.2 to 99.9) | 36.5 (31.2 to 42.1) | 59.8 (55.4 to 64.2) | 48.2 (43.1 to 53.3) | 98.3 (93.9 to 99.8) | |||
| Yes | 184 | 198 | 382 | |||||
| No | 2 | 114 | 116 | |||||
| Total | 186 | 312 | 498 | |||||
OA Osteoarthritis, Se Sensitivity, CI Confidence intervals, Sp Specificity, PPV Positive predictive values, NPV Negative predictive values