Skip to main content

Table 2 Descriptive statistics including mean difference and effect size

From: Responsiveness and convergent validity of QLU-C10D and EQ-5D-3L in assessing short-term quality of life following esophagectomy

 

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

  1. a1ttest difference in mean between baseline (7 days before esophagectomy) and follow-up (42 days after esophagectomy)
  2. b2Cohen’s d effect size calculation, recommended minimum effect size = 0.41, moderate effect = 1.15 and strong effect = 2.70
  3. 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
  4. *Statistically significant values at < 0.05
Back to article page

Health and Quality of Life Outcomes

ISSN: 1477-7525

Contact us