Table 3.
Demographic and Clinical Characteristics of Participants by Stair Climbing Activity Function, n= 106
| Variable | No difficulty Stair-Climbing: No difficulty, no modification; n=28 | Modified Stair-Climbing: No difficulty, uses modification; n=9 | Difficulty Stair-Climbing: Activity Difficulty; n=69 | Global p-value |
p-values from pairwise testing
|
||||
|---|---|---|---|---|---|---|---|---|---|
| No Difficulty vs. Modified | Difficulty vs. Modified | No Difficulty vs. Difficulty | |||||||
| Age, years | 63 (58.0, 73.5) | 58.0 (55.0, 61.0) | 59.0 (52.0, 66.0) | 0.08 | |||||
|
| |||||||||
| Sex, N (%) | Female | 23(82.14) | 9(100) | 46(66.7) | 0.04 | 0.31 | 0.05 | 0.15 | |
| Male | 5(17.86) | 0(0) | 23(33.3) | ||||||
|
| |||||||||
| Pain duration, years; | 6.0 (3.0, 10.0) | 10.0 (5.0, 12.0) | 5.0 (3.0, 10.0) | 0.11 | |||||
|
| |||||||||
| Race, N (%) | White | 20(71.4) | 7(77.8) | 37(53.6) | 0.16 | ||||
| Black | 4(14.3) | 1(11.1) | 25(36.2) | ||||||
| Other | 4(14.3) | 1(11.1) | 7(10.1) | ||||||
|
| |||||||||
| Education, N (%) | ≤High school | 5(17.9) | 1(11.1) | 12(17.4) | 1.00 | ||||
| At least some College | 23(82.1) | 8(88.9) | 57(82.6) | ||||||
|
| |||||||||
| Kellgren/Lawrence Grade | 0–1* | 2(7.4) | 1(11.1) | 6(9.0) | 0.79 | ||||
| 2 | 13(48.1) | 4(44.4) | 26(38.8) | ||||||
| 3 | 10(37.0) | 3(33.3) | 21(31.3) | ||||||
| 4 | 2(7.4) | 1(11.1) | 14(20.9) | ||||||
|
| |||||||||
| Body Mass Index, kg/m2 | 29.3 (25.2, 36.3) | 39.5 (27.1, 41.1) | 32.0 (28.3, 35.9) | 0.14 | |||||
|
| |||||||||
|
WOMAC Pain* Score Range, 0–500mm |
31.3 (14.5, 81.0) | 52.0 (14.5, 117.0) | 136.0 (53.7, 235.6) | 0.0002 | 0.43 | 0.08 | <0.0001 | ||
|
| |||||||||
|
WOMAC Function* Score Range, 0–1700mm |
106.3 (50.2, 235.6) | 227.0 (62.0, 316.5) | 488.5 (224.0, 864.5) | <0.0001 | 0.12 | 0.09 | <0.0001 | ||
|
| |||||||||
|
WOMAC Stiffness Score Range, 0–200mm |
13.0 (7.5, 37.0) | 14.5 (11.5, 51.0) | 56.0 (24.0, 111.5) | 0.002 | 0.27 | 0.19 | 0.001 | ||
|
| |||||||||
|
Patient Global Assessment Score Range, 0.0–10.0 |
1.4 (0.7, 3.5) | 2.4 (1.6, 8.6) | 4.5 (1.9, 5.6) | 0.007 | 0.08 | 0.92 | 0.002 | ||
|
| |||||||||
| 20 meter Gait Speed#, m/s | 1.293 (1.23, 1.465) | 1.18 (1.00, 1.31) | 1.16 (0.98, 1.34) | 0.007 | 0.08 | 0.90 | 0.002 | ||
|
| |||||||||
| 6 Minute Walk#, meters | 492.3 (417.3, 527.8) | 406.9 (361.0, 436.2) | 401.9 (366.7, 443.4) | 0.001 | 0.03 | 0.82 | 0.0003 | ||
|
| |||||||||
| 10 Repetition Chair Stand Test, seconds | 23.9 (19.5, 27.8) | 31.4 (23.5, 34.8) | 26.1 (21.8, 33.2) | 0.13 | |||||
|
| |||||||||
|
Berg Balance Score Range, 0–56# |
53.0 (52.0, 54.0) | 52.0 (50.0, 54.0) | 53.0 (51.0, 54.0) | 0.38 | |||||
|
| |||||||||
| 1RM Leg Extensor Muscle Strength, newtons# | 1070.6 (825.5, 1300.0) | 1235.8 (857.9, 1295.9) | 849.5 (695.5, 1121.5) | 0.30 | |||||
|
| |||||||||
| Muscle Contraction Velocity, meters/second (40% of 1RM)# | 0.5 (0.4, 0.6) | 0.4 (0.4, 0.5) | 0.5 (0.5, 0.6) | 0.26 | |||||
|
| |||||||||
| Muscle Contraction Velocity, meters/second (70% of 1RM)# | 0.3 (0.3, 0.4) | 0.3 (0.3, 0.4) | 0.4 (0.3, 0.4) | 0.42 | |||||
|
| |||||||||
| Muscle Power watts (40% of 1RM)# | 294.8 (196.3, 386.5) | 269.7 (233.8, 274.7) | 265.8 (202.0, 314.9) | 0.76 | |||||
|
| |||||||||
| Muscle Power watts (70% of 1RM)# | 271.0 (223.8, 369.2) | 302.1 (265.5, 359.6) | 269.5 (236.2, 382.1) | 0.99 | |||||
1RM= one-repetition maximum; WOMAC= Western Ontario and McMasters Osteoarthritis Index. Values are median (25th, 75th percentiles) unless stated otherwise.
*
Osteophyte was confirmed in the patellofemoral joint region for those with Kellgren/Lawrence grade 0 or 1.
#
Higher score indicates greater health.