Table 1.
Demographics and outcome measures (N=10,264).
| Variables | Baseline | Final | ||||||
|
|
Overall | Back pain (n=6468) | Knee pain (n=3796) | Overall | Back pain (n=6468) | Knee pain (n=3796) | ||
| Age (years), mean (SD) | 43.57 (11.14) | 42.58 (10.91) | 45.26 (11.33) | N/Aa | N/A | N/A | ||
| BMI, mean (SD) | 30.25 (7.42) | 29.76 (7.11) | 31.09 (7.84) | N/A | N/A | N/A | ||
| Gender | ||||||||
|
|
Female, n (%) | 5132 (50.00) | 4981 (48.53) | 5388 (52.49) | N/A | N/A | N/A | |
| Measures, mean (SD) | ||||||||
|
|
Pain (VASb) | 45.13 (22.42) | 45.81 (22.16) | 43.98 (22.81) | 14.24 (15.31) | 14.23 (15.12) | 14.33 (15.59) | |
|
|
PHQ-9c | 3.05 (5.34) | 3.35 (5.49) | 2.54 (5.04) | 1.85 (3.97) | 2.12 (4.12) | 1.43 (3.38) | |
|
|
PHQ-9d | 12.01 (4.61) | 11.99 (4.56) | 12.06 (4.73) | 5.05 (5.72) | 5.10 (5.73) | 4.95 (5.70) | |
|
|
GAD-7e | 3.93 (5.50) | 4.39 (5.69) | 3.15 (5.08) | 2.21 (3.83) | 2.48 (3.99) | 1.77 (3.51) | |
|
|
GAD-7f | 11.49 (4.10) | 11.56 (4.13) | 11.32 (4.04) | 4.78 (5.05) | 4.84 (5.01) | 4.65 (5.12) | |
|
|
One-year surgery likelihood (0-100) | 12.67 (21.55) | 9.07 (17.89) | 18.80 (25.51) | 4.14 (12.44) | 2.88 (9.26) | 6.26 (16.1) | |
|
|
WPAIg (0-100) | 31.74 (26.79) | 34.12 (26.37) | 27.54 (27.02) | 11.45 (15.60) | 12.24 (15.58) | 10.17 (15.57) | |
|
|
KOOS—painh | N/A | N/A | 15.23 (6.66) | N/A | N/A | 10.04 (5.81) | |
|
|
Modified von Korff | N/A | 15.95 (5.03) | N/A | N/A | 7.75 (5.44) | N/A | |
aN/A: not applicable.
bVAS: visual analog scale.
cPHQ-9: patient health questionnaire 9-item scale.
dThe mean and SD of the scores in depressed (PHQ-9>5) subjects.
eGAD-7: generalized anxiety disorder 7-item scale.
fThe mean and SD of the scores in anxious (GAD-7>5) subjects.
gWPAI: work productivity and activity impairment.
hKOOS—pain: knee injury and osteoarthritis outcome score—pain subscale.