Table 4.
Linear regression results of occurrence of adverse events (PCSI, reoperation) on subsequent change in functional outcome
| N | BP | PF | PCS | ODI | |
|---|---|---|---|---|---|
| Early event | |||||
| Minimum 12-month functional outcome by events within 6 months | |||||
| PCSI (SD) | 9 | 22.2 (33.1) | 6.7 (32.5) | 9.7 (11.6) | 6.3 (21.5) |
| No PCSI (SD) | 135 | 25.3 (29.9) | 22.1 (34.0) | 10.3 (14.9) | 19.0 (25.0) |
| Difference (95% CI) | −3.1 (−23.7, 17.4) | −15.4 (−38.5, 7.6) | −0.6 (−11.2, 10.1) | −12.7 (−31.9, 6.5) | |
| Reoperation (SD) | 2 | 10.0 (14.1) | 12.5 (53.0) | 16 (—) | 36.0 (—) |
| No reoperation (SD) | 142 | 25.4 (30.2) | 21.3 (33.9) | 10.2 (14.7) | 18.2 (25.0) |
| Difference (95% CI) | −15.4 (−57.8, 27.1) | −8.8 (−56.8, 39.2) | 5.8 (−23.4, 35.1) | 17.8 (−31.9, 67.6) | |
| Intermediate event | |||||
| Minimum 24-month functional outcome by events within 18 months | |||||
| PCSI (SD) | 10 | 15.0 (17.2) | 11.0 (40.7) | 6.3 (15.8) | 9.5 (20.2) |
| No PCSI (SD) | 59 | 26.4 (28.8) | 23.1 (38.3) | 10.1 (17.2) | 19.4 (24.9) |
| Difference (95% CI) | −11.4 (−30.2, 7.4) | −12.1 (−38.5, 14.3) | −3.8 (−16.2, 8.4) | −9.9 (−26.6, 6.8) | |
| Reoperation (SD) | 4 | 27.5 (15.0) | 28.8 (53.6) | 13.4 (14.6) | 17.3 (22.6) |
| No reoperation (SD) | 65 | 24.6 (28.3) | 20.9 (38.0) | 9.3 (17.1) | 18.0 (24.7) |
| Difference (95% CI) | 2.9 (−25.7, 31.5) | 7.9 (−32.1, 47.8) | 4.1 (−13.5, 21.7) | −0.7 (−26.0, 24.6) | |
Null hypothesis: no difference in mean change in functional outcome for events (PCSI, reoperation)
SD Standard deviation, CI confidence Interval, BP mean change in the bodily pain index (SF-36), PF mean change in the physical function index (SF-36), PCS mean change in physical component summary score (SF-36), ODI mean change in Oswestry disability index, PCSI postoperative cross-sectional imaging