. Author manuscript; available in PMC: 2019 Jul 10.

Published in final edited form as: J Int Neuropsychol Soc. 2019 Apr 29;25(6):583–594. doi: 10.1017/S1355617719000183

Table 1.

Correlations of WM measurements, age, depressed mood, and sleep quality in Study 1

	1	2	3	4	5	Mean (SD)
1. Capacity (K)	-					3.11(0.76)
2. Precision⁻¹ (SD)	.17	-				25.34(6.11)
3. Depressed mood-I^a	−.27^**	.05	-			4.52(3.68)
4. Sleep quality-I^a	−.28^**	.12	.54^**	-		5.58(2.58)
5. Depressed mood-II^b	−.27^**	.05	.98^**	.49^**	-	3.68(3.10)
6. Sleep quality-II^b	−.27^**	.11	.45^**	.96^**	.38^**	4.71(2.30)

Note: Mean (SD) for each variable is presented in the last column. Depressed mood was assessed with Patient Health Questionnaire-9 (PHQ-9). Sleep quality was measured with Pittsburgh Sleep Quality Index (PSQI) questionnaire.

^a).

Scores from full scales of PHQ-9 and PSQI;

^b)

Scores from the conceptually non-overlapping versions of PHQ-9 and PSQI.

^*.

p < .05;

^**.

p < .01.