Table 4.
Comparison of Sociodemographic Characteristics Between the Stable and Rising Groups
| Variable | Classification | Rising Group (n=359) | Stable Group (n=45) | p-value |
|---|---|---|---|---|
| Location, n (%) | Hospital A | 102 (87.93) | 14 (12.07) | 0.167 |
| Hospital B | 66 (92.96) | 5 (7.04) | ||
| Hospital C | 176 (89.34) | 21 (10.66) | ||
| Hospital D | 15 (75) | 5 (25) | ||
| Sex, n (%) | Male | 82 (90.11) | 9 (9.89) | 0.667 |
| Female | 277 (88.50) | 36 (11.50) | ||
| Age, years, n (%) | <60 | 81 (90) | 9 (10) | 0.703 |
| 60–74 | 216 (89.26) | 26 (10.74) | ||
| >74 | 62 (86.11) | 10 (13.89) | ||
| Marital status, N (%) | Unmarried | 37 (84.09) | 7 (15.91) | 0.287 |
| Married | 322 (89.44) | 38 (10.56) | ||
| Education, n (%) | Elementary school or below | 189 (85.52) | 32 (14.48) | 0.118 |
| Junior high school | 85 (93.41) | 6 (6.59) | ||
| Junior college or high school | 45 (91.84) | 4 (8.16) | ||
| College/bachelor or above | 38 (95) | 2 (5) | ||
| Smoker | No | 295 (93.65) | 83 (93.26) | 0.894 |
| Yes | 20 (6.35) | 6 (6.74) | ||
| Alcohol consumption | No | 299 (94.92) | 86 (96.63) | 0.501 |
| Yes | 16 (5.08) | 3 (3.37) | ||
| Income, CNY, n (%) | <2000* | 163 (82.32) | 35 (17.68) | <0.001 |
| 2000–4000 | 98 (92.45) | 8 (7.55) | ||
| >4000 | 93 (98.94) | 1 (1.06) | ||
| Medical insurance, n (%) | No | 331 (88.98) | 41 (11.02) | 0.799 |
| Yes | 28 (87.5) | 4 (12.5) | ||
| Duration of illness, years, n (%) | <5 | 151 (86.78) | 23 (13.22) | 0.134 |
| 6–15 | 154 (88.51) | 20 (11.49) | ||
| >15 | 54 (96.43) | 2 (3.57) | ||
| Expected duration of recovery, months, n (%) | <1 | 311 (88.86) | 39 (11.14) | 0.995 |
| ≥1 | 48 (88.89) | 6 (11.11) | ||
| TKA, n (%) | No | 323 (88.49) | 42 (11.51) | 0.472 |
| Yes | 36 (92.31) | 3 (7.69) | ||
| OJD, n (%) | No | 323 (88.493) | 42 (11.51) | 0.472 |
| Yes | 36 (92.31) | 3 (7.69) | ||
| Trauma, n (%) | No | 290 (88.96) | 36 (11.04) | 0.901 |
| Yes | 69 (88.46) | 9 (11.54) | ||
| Hospital stay, days, n (%) | <5 | 25 (92.59) | 2 (7.41) | 0.844 |
| 6–8 | 105 (88.98) | 13 (11.02) | ||
| 9–11 | 107 (89.92) | 12 (10.08) | ||
| >11 | 120 (86.96) | 18 (13.04) | ||
| Daily exercise, minutes, n (%) | None | 118 (83.69) | 23 (16.31) | 0.040 |
| <30 | 99 (93.40) | 7 (6.60) | ||
| ≥30 | 142 (90.45) | 15 (9.55) | ||
| Body mass index, n (%) | <18.5 | 3 (60) | 2 (40) | 0.159 |
| 18.5–24 | 100 (90.91) | 10 (9.09) | ||
| 24–28 | 143 (87.20) | 21 (12.81) | ||
| >28 | 113 (90.4) | 12 (9.6) | ||
| KOOS-PS_I | 60.150 ±4.09 | 56.156 ±7.94 | 0.002 | |
| KOOS-PS_S | 7.685 ±2.06 | 5.674 ±1.92 | <0.001 | |
| VAS_C | Decreasing group | 297 (94.29) | 18 (5.71) | <0.001 |
| Stable group | 62 (69.66) | 27 (30.34) |
Notes: Data are shown as mean±SD or n (%). KOOS-PS_I is the intercept term for KOOS-PS, and KOOS-PS_S is the slope term for KOOS-PS. VAS_C is the categorical latent variable of VAS for the decreasing group (n=315) and Stable group (n=89). *100 CNY equals approximately 14.9 USD (April 2019 exchange rate).
Abbreviations: EQ-5D-5L, European Quality of Life Five Dimension Five Level; KOOS-PS, Knee Injury and Osteoarthritis Outcome Score; OJD, Other Joint Diseases.