Table 2.
Baseline health-related quality of life for study participants compared to the US population norm
| Study sample (n = 87) | US population norm | |
|---|---|---|
| Physical functioning | 80 (70–95) | 90 (70–100) |
| Role physical, % ceilinga | 73.6 | 70.9 |
| Bodily pain | 74 (52–100) | 74 (61–100) |
| General health | 72 (57–87) | 72 (57–85) |
| Vitalityb | 50 (40–65) | 65 (45–75) |
| Social functioning | 87.5 (75–100) | 100 (75–100) |
| Role emotional,% ceilinga | 67.8 | 71.0 |
| Mental health | 76 (68–88) | 80 (64–88) |
| Physical component score, mean (SD)c | 49.1 (7.7) | 50.0 (10.0) |
| Mental component score, mean (SD)c | 49.4 (9.4) | 50.0 (10.0) |
% percent, SD standard deviation
SF-36 domain scores for the study sample and for the US population norm are presented as median (interquartile range) except where indicated. The component scores are presented as mean (standard deviation). Given the demographics of the study sample (men and women, aged 25–70) we did not use an age-specific norm
% ceiling refers to percent with RP or RE = 100
the bootstrap calculated 95% confidence interval of the median (42.9–57.1) suggests that study population VT is significantly lower than US population norm
Physical component score and mental component score are standardized to a mean of 50 such that above or below 50 represents better or worse than the US population average (see text)