PHQ-9 items as predictors of physical function MCID achievement.
| PHQ-9 Items | OR | 95% CI | P Valuea b |
| 12-Item Short Form physical component score MCID | |||
| Question 1 | 1.6 | (0.9, 2.7) | 0.092 |
| Question 2 | 1.2 | (0.7, 2.0) | 0.624 |
| Question 3 | 1.7 | (1.0, 2.9) | 0.037 |
| Question 4 | 1.5 | (0.8, 2.6) | 0.167 |
| Question 5 | 1.4 | (0.7, 2.5) | 0.355 |
| Question 6 | 1.2 | (0.6, 2.3) | 0.632 |
| Question 7 | 1.2 | (0.7, 2.2) | 0.460 |
| Question 8 | 1.6 | (0.7, 3.5) | 0.253 |
| Question 9b | - | - | - |
| Question 10 | 1.4 | (0.7, 2.7) | 0.309 |
| Overall PHQ-9 score | 1.1 | (0.9, 1.2) | 0.205 |
| Patient-Reported Outcomes Measurement Information System Physical Function MCID | |||
| Question 1 | 1.6 | (0.9, 2.9) | 0.137 |
| Question 2 | 1.1 | (0.6, 2.1) | 0.724 |
| Question 3 | 1.1 | (0.6, 1.9) | 0.828 |
| Question 4 | 1.3 | (0.7, 2.4) | 0.456 |
| Question 5 | 0.8 | (0.4, 1.5) | 0.503 |
| Question 6 | 0.9 | (0.5, 1.9) | 0.870 |
| Question 7 | 1.3 | (0.7, 2.6) | 0.388 |
| Question 8 | 1.3 | (0.5, 3.0) | 0.576 |
| Question 9b | - | - | - |
| Question 10 | 1.3 | (0.6, 2.7) | 0.473 |
| Overall PHQ-9 score | 1.1 | (0.9, 1.2) | 0.263 |
Abbreviations: MCID, minimum clinically important difference; PHQ, Patient Health Questionnaire.
Note: Boldface indicates statistical significance.
↵a P values calculated using logistic regression to assess each question as a predictor of MCID achievement.
↵b Unable to assess question 9 due to the limited number of patients with affirmative responses.