Table 3. Correlations of fatigue, as measured by the scores of the Identity-Consequence Fatigue Scale summary variables (fatigue experiences and fatigue impacts), with other variables studied.

Variable	Fatigue experiences			Fatigue impacts
	r	p	pa	r	p	p*
Fatigue Severity Scale	0.60	< 0.001	0.007	0.52	< 0.001	0.007
FEV1, % of predicted	0.14	0.313	2.171	0.12	0.376	2.591
6MWD	−0.16	0.261	1.827	−0.09	0.950	6.651
HADS-A	0.43	0.002	0.014	0.62	< 0.001	0.007
HADS-D	0.60	< 0.001	0.007	0.63	< 0.001	0.007
SF-36 MCS	−0.55	< 0.001	0.007	−0.48	< 0.001	0.007
SF-36 PCS	0.29	0.239		0.16	0.102	0.714
Epworth Sleepiness Scale	0.19	0.181	1.267	0.32	0.021	0.147
CRP, mg/L	0.28	0.048	0.336	0.50	< 0.001	0.007

6MWD: six-minute walk distance; HADS-A: Hospital Anxiety and Depression Scale-anxiety subscale; HADS-D: Hospital Anxiety and Depression Scale-depression subscale; SF-36: Medical Outcomes Study 36-item Short-Form Health Survey; MCS: mental component summary; PCS: physical component summary; and CRP: C-reactive protein. *After Bonferroni correction: α critical = 0.048.