Correlations for all pairs of data series (method=pearson)
	I_felt_depressed	I_felt_sad	everything_was_effort	trouble_mind	I_enjoyed_life	sleep_restless
I_felt_depressed	1	0.736	0.435	0.343	-0.518	0.317
I_felt_sad	0.736	1	0.452	0.362	-0.454	0.365
everything_was_effort	0.435	0.452	1	0.362	-0.334	0.279
trouble_mind	0.343	0.362	0.362	1	-0.289	0.263
I_enjoyed_life	-0.518	-0.454	-0.334	-0.289	1	-0.233
sleep_restless	0.317	0.365	0.279	0.263	-0.233	1

Correlations for all pairs of data series with p-values
pair	Pearson r	Spearman rho	Kendall tau
I_felt_depressed;I_felt_sad	0.7356	0.6532	0.621
p-value	(0)	(0)	(0)
I_felt_depressed;everything_was_effort	0.4347	0.4233	0.3836
p-value	(0)	(0)	(0)
I_felt_depressed;trouble_mind	0.3427	0.3394	0.3048
p-value	(0)	(0)	(0)
I_felt_depressed;I_enjoyed_life	-0.5178	-0.5122	-0.4756
p-value	(0)	(0)	(0)
I_felt_depressed;sleep_restless	0.3171	0.236	0.2133
p-value	(1e-04)	(0.0041)	(0.0036)
I_felt_sad;everything_was_effort	0.4519	0.4292	0.3863
p-value	(0)	(0)	(0)
I_felt_sad;trouble_mind	0.362	0.3475	0.3096
p-value	(0)	(0)	(0)
I_felt_sad;I_enjoyed_life	-0.4543	-0.4827	-0.4468
p-value	(0)	(0)	(0)
I_felt_sad;sleep_restless	0.3649	0.3194	0.2855
p-value	(0)	(1e-04)	(1e-04)
everything_was_effort;trouble_mind	0.3622	0.3761	0.3319
p-value	(0)	(0)	(0)
everything_was_effort;I_enjoyed_life	-0.3341	-0.3877	-0.3425
p-value	(0)	(0)	(0)
everything_was_effort;sleep_restless	0.2793	0.2834	0.2496
p-value	(6e-04)	(5e-04)	(5e-04)
trouble_mind;I_enjoyed_life	-0.2888	-0.3031	-0.2617
p-value	(4e-04)	(2e-04)	(3e-04)
trouble_mind;sleep_restless	0.2633	0.2466	0.2106
p-value	(0.0013)	(0.0027)	(0.0029)
I_enjoyed_life;sleep_restless	-0.2331	-0.2291	-0.202
p-value	(0.0046)	(0.0054)	(0.0052)