Knee and hip pain intensity at baseline and changes after 3 and 12 months following supervised exercise therapy and education
| Pain intensity t0 | Pain intensity t3 | Pain intensity t12 | |||
| Adjusted model for education* | Mean (95% CI) | Mean (95% CI) | Mean difference t0 to t3 (95% CI) | Mean (95% CI) | Mean difference t0 to t12 (95% CI) |
| Primary school (ref.) | 52.0 (51.3 to 52.8) | 39.9 (39.1 to 40.6) | 12.1 (11.4 to 12.9) | 38.4 (37.4 to 39.3) | 13.6 (12.7 to 14.6) |
| Mean difference (95% CI) | Mean difference (95% CI) | Difference in change from t0 to t3 (95% CI) in relation to the ref. | Mean difference (95% CI) | Difference in change from t0 to t12 (95% CI) in relation to the ref. | |
| Secondary school | −2.7 (−3.8 to −1.6) | −3.8 (−4.9 to −2.7) | −1.1 (−2.3 to 0.1) | −3.0 (−4.4 to −1.6) | −0.3 (−1.8 to 1.2) |
| Short-term education† | −4.2 (−5.2 to −3.3) | −4.9 (−5.9 to −4.0) | −0.7 (−1.7 to 0.3) | −3.4 (−4.6 to -2.3) | 0.8 (−0.5 to 2.1) |
| Middle-term education‡ | −6.1 (−6.9 to −5.3) | −6.3 (−7.2 to −5.5) | −0.2 (−1.1 to 0.7) | −5.2 (−6.2 to −4.2) | 0.9 (−0.2 to 2.0) |
| Long-term education§ | −10.3 (−11.4 to −9.2) | −8.4 (−9.5 to −7.2) | 2.0 (0.8 to 3.1) | −8.3 (−9.6 to −7.0) | 2.0 (0.6 to 3.4) |
| Adjusted model for employment¶ | Mean (95% CI) | Mean (95% CI) | Mean difference t0 to t3 (95% CI) | Mean (95% CI) | Mean difference t0 to t12 (95% CI) |
| Retired (ref.)** | 46.2 (45.8 to 46.7) | 34.8 (34.3 to 35.3) | 11.4 (11.0 to 11.8) | 34.0 (33.5 to 34.5) | 12.2 (11.7 to 12.7) |
| Mean difference (95% CI) | Mean difference (95% CI) | Difference in change from t0 to t3 (95% CI) in relation to the ref. | Mean difference (95% CI) | Difference in change from t0 to t12 (95% CI) in relation to the ref. | |
| Employed/student | 1.1 (0.3 to 1.9) | −1.1 (−1.9 to −0.2) | −2.2 (−2.9 to −1.5) | −0.2 (−1.1 to 0.7) | −1.3 (−2.1 to −0.5) |
| Unemployed | 3.7 (1.6 to 5.7) | 2.1 (−0.1 to 4.3) | −1.6 (−3.8 to 0.7) | 6.2 (3.5 to 8.9) | 2.6 (−0.3 to 5.4) |
| Sick leave (part/full time) | 7.2 (5.7 to 8.6) | 3.8 (2.3 to 5.4) | −3.4 (−4.9 to −1.9) | 2.7 (0.9 to 4.5) | −4.5 (−6.4 to −2.6) |
| Early retirement†† | 6.6 (4.9 to 8.3) | 4.6 (2.8 to 6.4) | −2.0 (−3.9 to −0.2) | 3.8 (1.6 to 5.9) | −2.8 (−5.1 to −0.6) |
The numbers in the rows for the reference groups (primary school/retired) are actual numbers, while the numbers in the other rows are differences between that group and the reference. Negative prefix correspond to lower pain intensity or greater change pain intensity, as compared with the reference.
Numbers included in the models for education, n=22 588.
Numbers included in the models for employment, n=22 477.
*Model for education adjusted for age and gender.
†Under 3 years after secondary school.
‡3–4 years after secondary school.
§At least 5 years after secondary school.
¶Model for employment adjusted for age, gender, BMI, educational level, SF-12 MCS, number of comorbidities and prior surgery on index joint.
**Retired, including self-imposed early retirement.
††Early retirement due to low ability to work.
BMI, body mass index; SF-12 MCS, 12-Item Short Form Survey for mental component summary score; t0, baseline; t3, after 3 months; t12, after 12 months.