Table 2.

Test–retest reliability of K10 and K6 questions

Items	Spearman correlation coefficients
Q1	0.40
Q2a	0.32
Q3	0.26
Q4a	0.42
Q5a	0.37
Q6	0.29
Q7	0.45
Q8a	0.42
Q9a	0.44
Q10a	0.46
Total score of K6	0.50
Total score of K10	0.51

^aItems included in K6.