Table 1. Demographics of the patients.
| Variables | Knee OA patients | |||
|---|---|---|---|---|
| Total (n = 1,334) |
Adherent (n = 1,167) |
Non-Adherent (n = 167) |
P value* | |
| Female, No. (%) | 1,065 (79.8) | 923 (79.1) | 142 (85.0) | 0.074 |
| Age, mean (SD) | 74.3 (5.4) | 74.4 (5.4) | 73.7 (5.5) | 0.122 |
| Age groups (yr), No. (%) | 0.027 | |||
| 65 - 69 | 270 (20.2) | 222 (19.0) | 48 (27.7) | |
| 70 - 74 | 500 (37.5) | 440 (37.7) | 60 (35.9) | |
| 75 - 79 | 346 (25.9) | 311 (26.6) | 35 (21.0) | |
| 80 ≤ | 218 (16.3) | 194 (16.6) | 24 (14.4) | |
| Education, No. (%) | 0.555 | |||
| Elementary school | 676 (52.4) | 594 (52.3) | 82 (53.2) | |
| Middle school | 279 (21.6) | 252 (22.2) | 27 (17.5) | |
| High school | 265 (20.6) | 231 (20.4) | 34 (22.1) | |
| University | 60 (4.7) | 51 (4.5) | 9 (5.8) | |
| Graduate school | 9 (0.7) | 7 (0.6) | 2 (1.3) | |
| Height, mean (SD), cm | 157.1 (6.9) | 157.2 (6.9) | 156.7 (6.8) | 0.379 |
| Weight, mean (SD), kg | 30.3 (8.7) | 60.2 (8.8) | 60.6 (8.4) | 0.594 |
| BMI, mean (SD) | 24.4 (3.1) | 24.4 (3.1) | 24.7 (3.0) | 0.179 |
| Duration (mon) of knee OA, mean (SD) | 67.0 (78.5) | 66.4 (78.9) | 70.9 (75.1) | 0.486 |
| Number of NSAID treatment, No. (%)† | 0.201 | |||
| 1 | 778 (58.3) | 676 (57.9) | 102 (61.1) | |
| 2 | 509 (38.2) | 453 (38.8) | 56 (33.5) | |
| 3 | 47 (3.5) | 38 (3.3) | 9 (5.4) | |
OA, osteoarthritis; BMI, body mass index (kg/m2); SD, standard deviation; NSAIDs, non-steroidal anti-inflammatory drugs.
Values are presented by number (%) or mean (SD).
*χ2 test for categorical data and Student t-test for continuous data were performed; †Frequency of daily NSAIDs administration.