Table 3.
Secondary outcomes at 12 months (categorical outcomes)
| Usual care group | Intervention group | Odds ratio*(95% CI) | p value | |
|---|---|---|---|---|
| Chronic widespread pain | ||||
| Yes | 7/100 (7%) | 9/212 (4%) | 0·61 (0·20 to 1·91) | 0·399 |
| No | 93/100 (93%) | 203/212 (96%) | .. | .. |
| Pain frequency in past 24 h | ||||
| Rarely | 21/100 (21%) | 55/213 (26%) | 0·64 (0·34 to 1·21) | 0·170 |
| Sometimes | 28/100 (28%) | 63/213 (30%) | .. | .. |
| Often | 20/100 (20%) | 41/213 (19%) | .. | .. |
| Most of the time | 18/100 (18%) | 35/213 (16%) | .. | .. |
| All of the time | 13/100 (13%) | 19/213 (9%) | .. | .. |
| Pain frequency in past 4 weeks | ||||
| Rarely | 16/93 (17%) | 45/198 (23%) | 0·55 (0·27 to 1·11) | 0·095 |
| Sometimes | 26/93 (28%) | 50/198 (25%) | .. | .. |
| Often | 22/93 (24%) | 43/198 (22%) | .. | .. |
| Most of the time | 20/93 (22%) | 42/198 (21%) | .. | .. |
| All of the time | 9/93 (10%) | 18/198 (9%) | .. | .. |
| Comparison of pain† | ||||
| Much better | 44/91 (48%) | 111/198 (56%) | 0·62 (0·34 to 1·12) | 0·113 |
| A bit better | 21/91 (23%) | 39/198 (20%) | .. | .. |
| The same | 11/91 (12%) | 15/198 (8%) | .. | .. |
| A bit worse | 8/91 (9%) | 19/198 (10%) | .. | .. |
| Much worse | 7/91 (8%) | 14/198 (7%) | .. | .. |
Data are number of patients in the format n/N (%), unless otherwise stated. All descriptive statistics are unadjusted. BPI=Brief Pain Inventory.
*
All analyses are adjusted for hospital site, baseline BPI subscores and baseline score for each outcome measure.
†
Comparison of pain: how does the pain you have in your replaced knee now compare to the pain you had in your knee before your operation?