Table 2—

Pearson correlations between Sickness Impact Profile (SIP) overall, SGRQ total scores, forced expiratory volume in one second (FEV₁) with other outcome measures

SIP Overall		SGRQ Total		FEV₁
Outcome measure	correlation	Outcome measure	correlation	Outcome measure	Correlation
P _a,O₂	ns	P _a,CO₂	ns	HADS anxiety	ns
P _a,CO₂	ns	SIP Work	ns	SIP emotional behaviour	ns
HADS anxiety	0.28*	P _a,O₂	ns	SIP work	ns
SGRQ symptoms	0.31**	SIP alertness behavior	0.28*	SIP alertness behaviour	ns
FEV₁	0.32**	SIP communication	0.31**	HADs depression	ns
TLCO	0.35**	HADS anxiety	0.36**	SGRQ symptoms	ns
VC	0.50***	TLCO	0.37**	MACL	ns
MACL	0.52***	FEV₁	0.42***	SIP psychosocial dimension	ns
HADS depression	0.57***	VC	0.44***	SIP sleep and rest	ns
6MWD	0.62***	SIP recreation/pastimes	0.46***	SIP body care/movement	Ns
SGRQ activity	0.64***	SIP emotional behavior	0.49***	SIP communication	ns
SGRQ impacts	0.69***	SIP body care/movement	0.49***	SIP social interaction	ns
SGRQ total	0.69***	SIP eating	0.51***	SIP mobility	0.25*
		SIP social interaction	0.54***	SIP overall	0.32**
		MACL	0.54***	SIP physical dimension	0.34**
		SIP psychosocial dimension	0.56***	P _a,O₂	0.39**
		SIP home management	0.58***	SGRQ impacts	0.40***
		HAD depression	0.59***	SIP recreation/pastimes	0.41***
		SIP ambulation	0.60***	SGRQ total	0.42***
		6MWD	0.61***	SIP eating	0.42***
		SIP mobility	0.61***	6MWD	0.45***
		SIP sleep and rest	0.62***	SIP home management	0.46***
		SIP physical dimension	0.64***	SIP ambulation	0.49***
		SIP overall	0.69***	SGRQ activity	0.49***
				TLCO	0.52***
				P _a,CO₂	0.56***
				VC	0.71***

Intra-scale correlations are not presented
ns: nonsignificant
*p<0.05
**p<0.01
***p<0.001
No consideration has been taken to direction of correlations
P_a,O₂: oxygen tension in arterial blood
P_a,CO₂: carbon dioxide tension arterial blood
HADS: Hospital Anxiety and Depression Scale
TLCO: carbon monoxide transfer factor
VC: vital capacity
MACL: Mood Adjective Check List
6MWD: 6-min walking distance