Table 2.
Pre- and postoperative HRQOL in the study population
| Preoperative Mean (SD) N = 127 |
Postoperative Mean (SD) N = 87 |
Difference in scores * | Population norm ** | |
|---|---|---|---|---|
|
SF-36 Physical Functioning Subscale Effect size*** |
56.8 (23.3) -1.41 | 87.5 (19.1) - .11 | < .001 | 89.6 |
|
SF-36 Physical Role Limitation Subscale Effect size*** |
40.3 (39.1) -1.06 | 74.7 (39.3) - .18 | < .001 | 81.9 |
|
SF-36 Bodily Pain Subscale Effect size*** |
46.3 (25.1) -1.18 | 66.5 (29.9) - .31 | < .001 | 75.8 |
|
SF-36 General Health Subscale Effect size*** |
47.8 (22.2) -1.38 | 78.7 (23.0) .01 | < .001 | 78.5 |
|
SF-36 Vitality Subscale Effect size*** |
40.9 (19.4) - .95 | 61.1 (21.4) .09 | < .001 | 59.3 |
|
SF-36 Social Function Subscale Effect size*** |
71.5 (25.0) - .57 | 89.0 (19.9) .16 | < .001 | 85.9 |
|
SF-36 Emotional Role Limitation Subscale Effect size*** |
78.8 (36.5) - .12 | 83.7 (34.4) - .15 | .201 | 83.4 |
|
SF-36 Mental Health Subscale Effect size*** |
73.3 (16.1) - .32 | 80.9 (17.2) .16 | < .001 | 78.4 |
*Difference in scores from preoperative assessment to postoperative assessment, Wilcoxon Signed Rank Test
** Population norm [39], adjusted for age and gender.
*** Effect size is calculated by subtracting the mean score of the population norm (adjusted for age and gender) from the mean score of the patients group and divided by the standard deviation of the patient group.