Table 1.
Descriptive statistics and comparison of those who did, and did not, complete the 5-year follow-up questionnaire
| Variable | Missing | Baseline (n=1431) | Non-responders at year 5 | Responders at year 5 | p Value* |
|---|---|---|---|---|---|
| Oxford Hip Score | |||||
| Preoperative | 70 (4.9%) | 16.4 (7.8) | 16.1 (8.2) | 16.5 (7.6) | 0.35 |
| 1 year postoperative | 274 (19.1%) | 43 (36, 46) | – | – | |
| 2 year postoperative | 316 (22.1%) | 43 (36, 47) | – | – | |
| 3 year postoperative | 368 (25.7%) | 43 (36, 47) | – | – | |
| 4 year postoperative | 430 (30.0%) | 44 (36, 47) | – | – | |
| 5 year postoperative | 396 (27.7%) | 43 (37, 47) | – | – | |
| Patient characteristics | |||||
| Age | 9 (1%) | 70.0 (63.9, 76.1) | 73.6 (66.2, 79.3) | 68.8 (62.7, 74.5) | <0.001 |
| BMI | 95 (7%) | 27.4 (4.9) | 27.1 (4.9) | 27.6 (4.8) | 0.077 |
| Gender | 7 (0%) | 0.46 | |||
| Male | 537 (38%) | 171 (39%) | 366 (37%) | ||
| Female | 887 (62%) | 266 (61%) | 621 (63%) | ||
| Occupation | 0 (0%) | 0.005 | |||
| Heavy manual | 41 (3%) | 8 (2%) | 33 (3%) | ||
| Light manual | 89 (6%) | 20 (5%) | 69 (7%) | ||
| Office/professional | 107 (7%) | 21 (5%) | 86 (9%) | ||
| Housewife | 187 (13%) | 67 (15%) | 120 (12%) | ||
| Unemployed/retired | 1007 (70%) | 325 (74%) | 682 (69%) | ||
| Number of coexisting diseases | 0 (0%) | 0.94 | |||
| 0 | 431 (30%) | 136 (31%) | 295 (30%) | ||
| 1 | 498 (35%) | 147 (33%) | 351 (35%) | ||
| 2 | 315 (22%) | 99 (22%) | 216 (22%) | ||
| 3 | 140 (10%) | 43 (10%) | 97 (10%) | ||
| 4 | 47 (3%) | 16 (4%) | 31 (3%) | ||
| Concomitant therapy used | 8 (1%) | 0.84 | |||
| No | 104 (7%) | 31 (7%) | 73 (7%) | ||
| Yes | 1319 (93%) | 406 (93%) | 913 (93%) | ||
| SF36 mental health score | 515 (36%) | 74 (60, 88) | 72 (52, 88) | 76 (60, 88) | 0.046 |
Cells represent either: number (percentage), mean (SD), median (IQR).
Where continuous variables were not normally distributed, a non-parametric t test (Kruskal-Wallis) was used.
Fisher’s exact test is used where the expected counts are less than 5.
*t Tests are used for continuous variables and χ2 tests for categorical variables.