Table 1 Score statistics and reliabilities (α) at baseline and follow-up.

Baseline score (SD, IQR¹)

7.98 (4.52, 5–12)

5.12 (6.28, 1–7)

59.32 (24.64, 44–81)

Follow-up score (SD, IQR)

14.25 (5.06, 10–19)

6.13 (7.57, 0–9)

65.22 (24.17, 50–81)

Mean change score (SD)²

6.27 (3.21)

1.01 (4.36)

5.90 (17.13)

SRM³

1.95

0.23

0.34

Chronbach's α time 1

0.86

0.92

0.83

Chronbach's α time 2

0.89

0.94

0.84