Table 2 Baseline and follow-up measures and change in physical and mental health and gait speed in participants with knee replacement and controls
From: Functional outcomes following knee replacement in community-dwelling older adults
|  | Participants with knee replacement N = 596 | Age- and sex-matched controls N = 812 | Difference between groups | |||||
|---|---|---|---|---|---|---|---|---|
Baseline Mean (SD) | Follow-up Mean (SD) | Changeb Mean (95% CI) | Baseline Mean (SD) | Follow-up Mean (SD) | Changeb Mean (95% CI) | Changeb Mean (95% CI) | P | |
PCS | 40.4 (10.6) | 44.1 (10.3) | 3.6 (2.9, 4.3) | 47.7 (8.9) | 47.6 (9.3) | -0.02 (-0.6, 0.6) | 3.6 (2.7, 4.6) |  < 0.001 |
MCS | 56.7 (8.3) | 55.8 (8.1) | -1.0 (-1.6, -0.3) | 55.9 (7.0) | 55.8 (7.1) | 0.02 (-0.6, 0.6) | -1.0 (-1.8, -0.1) | 0.02 |
Physical function | 40.6 (11.3) | 44.0 (11.3) | 3.4 (2.6, 4.2) | 47.4 (9.4) | 47.4 (10.2) | 0.2 (-0.5, 0.9) | 3.1 (2.1, 4.2) |  < 0.001 |
Role physical | 45.0 (10.0) | 46.6 (9.4) | 1.4 (0.6, 2.2) | 49.6 (8.2) | 49.5 (8.7) | 0.1 (-0.6, 0.7) | 1.3 (0.3, 2.3) | 0.01 |
Bodily pain | 41.1 (11.1) | 46.2 (11.1) | 4.9 (3.9, 5.8) | 49.3 (9.9) | 49.3 (10.1) | -0.02 (-0.8, 0.7) | 4.9 (3.7, 6.1) |  < 0.001 |
General health | 49.4 (9.1) | 50.0 (8.8) | 0.6 (-0.004, 1.3) | 51.9 (7.4) | 51.6 (8.6) | -0.3 (-0.9, 0.2) | 1.0 (0.1, 1.8) | 0.03 |
Vitality | 52.1 (9.4) | 52.9 (9.2) | 0.6 (-0.1, 1.4) | 54.8 (8.3) | 54.6 (8.4) | -0.1 (-0.7, 0.5) | 0.7 (-0.2, 1.7) | 0.15 |
Social functioning | 51.7 (8.8) | 52.5 (8.3) | 0.8 (0.03, 1.5) | 53.5 (7.2) | 53.3 (7.4) | -0.2 (-0.8, 0.5) | 0.9 (-0.05, 1.9) | 0.06 |
Role emotional | 50.2 (8.8) | 50.5 (8.8) | 0.3 (-0.5, 1.0) | 51.5 (7.1) | 51.6 (7.6) | 0.2 (-0.3, 0.8) | 0.001 (-0.9, 0.9) | 1.00 |
Mental health | 54.2 (8.3) | 54.3 (8.2) | -0.005 (-0.7, 0.7) | 55.0 (7.9) | 55.0 (7.8) | 0.1 (-0.5, 0.6) | -0.1 (-1.0, 0.8) | 0.86 |
Gait speed (m/sec)a | 0.97 (0.21) | 0.93 (0.20) | -0.04 (-0.06, -0.02) | 1.04 (0.22) | 0.99 (0.22) | -0.05 (-0.06, -0.04) | 0.01 (-0.01, 0.03) | 0.29 |