Table 4. Test-retest reliability and concurrent validity of the MDSS questionnaire expressed as the binary variable (originally proposed cut-off values were applied for both MEDAS and MDSS).

	MDSS test		MEDAS test		MEDAS retest
	N (%)		N (%)		N (%)
MDSS retest	No	Yes	No	Yes	No	Yes
No; N (%)	168 (80.0)	10 (4.8)	146 (69.5)	32 (15.2)	150 (71.4)	28 (13.3)
Yes; N (%)	12 (5.7)	20 (9.5)	19 (9.1)	13 (6.2)	19 (9.1)	13 (6.2)
κ (P)	0.584 (<0.001)		0.194 (0.004)		0.223 (<0.001)
MEDAS retest	No	Yes	No	Yes	No	Yes
No; N (%)	152 (72.4)	17 (8.1)	154 (73.3)	15 (7.2)
Yes; N (%)	28 (13.3)	13 (6.2)	11 (5.2)	30 (14.3)
κ (P)	0.241 (<0.001)		0.620 (<0.001)		n/a
MDSS test	No	Yes	No	Yes	No	Yes
No; N (%)			260 (72.2)	51 (14.2)
Yes; N (%)			29 (8.0)	20 (5.6)
κ (P)	n/a		0.205 (<0.001)		n/a