Table 2. Logistic regression modeling including final predictor variables, individual P values for each model variable, as well as odds ratios and 95% confidence intervals.
| Model | Variables | Individual P value | Odds ratio (95% confidence interval) | Nagelkerke R2 | Model P value | % Correct |
| ODI 50% change (N = 149) | Met CPR | 0005 | 2916 (1380–6163) | 0231 | 0000 | 570% |
| Younger age | 0003 | 1041 (1014–1069) | ||||
| Diagnosis | 0014 | 0385(0180–0824) | ||||
| ODI 30% change (N = 149) | Lower baseline FABQ | 0044 | 1039 (1001–1079) | 0214 | 0000 | 705% |
| Shorter symptom duration | 0012 | 1008 (1002–1014) | ||||
| Younger age | 0001 | 1054 (1023–1087) | ||||
| Diagnosis | 0012 | 0337 (0144–0788) | ||||
| ODI 17-point change (N = 116)a | Higher baseline ODI | 0010 | 0954 (0921–0989) | 0245 | 0000 | 483% |
| Shorter symptom duration | 0064 | 1009 (0999–1020) | ||||
| Diagnosis | 0063 | 0441 (0186–1046) | ||||
| Met CPR | 0007 | 3387 (1402–8182) | ||||
| ODI 10-point change (N = 138)b | Higher baseline ODI | 0002 | 0951 (0921–0981) | 0172 | 0001 | 667% |
| Younger age | 0020 | 1035 (1005–1065) | ||||
| Diagnosis | 0091 | 0490 (0215–1120) | ||||
| ODI five-point change (N = 144)c | Higher baseline ODI | 0008 | 0956 (0924–0989) | 0139 | 0006 | 792% |
| Younger age | 0043 | 1034 (1001–1068) | ||||
| Diagnosis | 0082 | 0442 (0176–1110) | ||||
| ODI final ≤20% (N = 107)d | Lower baseline ODI | 0000 | 1113 (1055–1175) | 0491 | 0000 | 561% |
| Younger age | 0002 | 1064 (1023–1105) | ||||
| Shorter symptom duration | 0083 | 1009 (0999–1018) | ||||
| Diagnosis | 0061 | 0366 (0128–1047) | ||||
| Met CPR | 0029 | 3288 (1130–9566) |
ODI = Oswestry disability index; CPR = Clinical prediction rule; FABQ-w = Fear avoidance beliefs questionnaire work subscale.
a N adjusted for 33 patients with baseline ODI of less than 17%; b N adjusted for 11 patients with baseline ODI of less than 10%; c N adjusted for five patients with baseline ODI less than 5%; d N adjusted for 42 patients with baseline ODI of less than 20%.