Table 1 Background or personal and clinical factors in the case- and control-group
ICF | Variables | Cases (n = 28) | Controls (n = 31) | Statistics t, χ2, U | P-value |
|---|---|---|---|---|---|
Personal factors | Female, n (%) | 18 (64) | 16 (52) | 379 (χ2) | 0.3294 |
Age, yrs., M (SD) | 61.7 (6.4) | 55.3 (8.0) | 3.4 (t) | 0.0014* | |
Height, m, M (SD) | 1.72 (0.10) | 1.73 (0.09) | -0.7 (t) | 0.517 | |
Weight, kg, M (SD) | 82.9 (12.7) | 80.4 (16.6) | 0.7 (t) | 0.517 | |
BMI, kg/m2, M (SD) | 24.3 (3.5) | 25.2 (5.1) | 1.0 (t) | 0.317 | |
Education, n (%) | |||||
 secondary school (10 yrs) | 1 (4) | 0 (0) |  |  | |
 high school (13 yrs) | 6 (21) | 6 (19) |  |  | |
 graduate (16 yrs) | 14 (50) | 13 (42) |  |  | |
 post graduate (18 yrs. +) | 7 (25) | 12 (39) | 368 (U) | 0.281 | |
Dominant leg (right, left, n) | 26, 2 | 28, 3 | Â | Â | |
Body function | Years since diagnosis, M (SD) | 10.2 (8.6) | Â | Â | Â |
Years of knee pain, n (%) | |||||
 1 yrs | 2 (7) |  |  |  | |
 1 to 3 yrs. | 3 (11) |  |  |  | |
 3 to 10 yrs | 7 (25) |  |  |  | |
 >  10 yrs | 16 (57) |  |  |  | |
Pain last week, Med (IQR) | 3.5 (4.8) | 0.0 (1.0) | 3.0 | Â | |
KOOS Pain, Med (IQR) (R) | 58.8 (18.8) | 98.4 (3.6) | −38.9 |  | |
Case-group only | |||||
 X-ray grade (n knees, %) | Inv. leg | Uninv. leg |  |  | |
  No X-rays taken | 0 (0) | 10 (36) |  |  | |
  KL-grade II | 9 (32) | 9 (32) |  |  | |
  KL-grade III | 17(61) | 8 (29) |  |  | |
  KL-grade IV | 2 (7) | 1 (4) |  |  | |
 KOOS Sympt., Med (IQR) (R) | 58.9 (33.9) | 96.4 (7.1) | −35.8 |  | |
Activity function. |  KOOS ADL, Med (IQR) (R) | 66.7 (39.6) | 100.0 (13.3) | −32.4 |  |
 KOOS Sport/Rec, Med (IQR) (R) | 30.0 (25.6) | 100.0 (5.0) | −65.0 |  | |
Participation function |  KOOS QoL, Med (IQR) (R) | 43.8 (25.0) | 100 (13.9) | −56.2 |  |