Table 5.

Presence of specific symptoms detected by K6 at waves 1 and 2 (ANOVA 1 way with Bonferroni correction).

	Wave 1 (Mean ± SD)	Wave 2 (Mean ± SD)	F1,597,598 df	P
K6. Item 1 = nervous	2.54 ± 1.23	3.06 ± 1.14	24.270	<0.0001
K6. Item 2 = hopeless	2.81 ± 1.21	3.24 ± 1.18	16.642	<0.0001
K6. Item 3 = restless or fidgety	3.24 ± 1.12	3.47 ± 1.28	4.988	0.026
K6. Item 4 = so depressed that nothing could cheer you up	3.09 ± 1.28	3.20 ± 1.13	1.030	0.311
K6. Item 5 = that everything was an effort	2.66 ± 1.34	3.20 ± 1.12	23.291	<0.0001
K6. Item 6 = worthless	3.43 ± 1.51	3.19 1.21	3.696	0.055
Total score	17.77 ± 5.12	19.20 ± 5.75	9.347	0.002