Table 2.
Descriptive statistics including mean difference and effect size
| EQ-5D-3L | QLU-C10D | EORTC summary score | |
|---|---|---|---|
| Pre-operative mean (sd) | 0.85 (0.15) | 0.81 (0.16) | 84.3 (13.1) |
| Post-operative mean (sd) | 0.69 (0.16) | 0.52 (0.22) | 62.5 (17.9) |
| Mean difference (95% CI) | 0.16 (0.13, 0.19) | 0.29 (0.26, 0.32) | 21.6 (18.9, 24.4) |
| p valuea1 | 0.000* | 0.000* | 0.000* |
| Standard effect size (ES)b2 | 1.08 | 1.53 | 1.38 |
| Standard response mean (SRM)c3 | 0.84 | 1.37 | 1.22 |
a1ttest difference in mean between baseline (7 days before esophagectomy) and follow-up (42 days after esophagectomy)
b2Cohen’s d effect size calculation, recommended minimum effect size = 0.41, moderate effect = 1.15 and strong effect = 2.70
c3Standard Response Measure (ratio of the mean change to the standard deviation of that change), < 0.20 = trivial effect, 0.20– < 0.50 = small effect, 0.50–0.80 = moderate effect, > 0.80 = large effect
*Statistically significant values at < 0.05