Table 2

Correlations between the original SGRQ or SGRQ-I scores and other outcome measures

	Symptoms		Activity		Impacts		Total
	SGRQ	SGRQ-I	SGRQ	SGRQ-I	SGRQ	SGRQ-I	SGRQ	SGRQ-I
FVC%	−0.27^*	−0.25^†	−0.31^†	−0.30^†	−0.30^†	−0.31^†	−0.34^†	−0.33^†
Tlco%	−0.23^*	−0.25^†	−0.34^†	−0.33^†	−0.38^†	−0.36^†	−0.38^†	−0.37^†
6MWD	−0.14	−0.12	−0.32^†	−0.30^†	−0.24^*	−0.26^†	−0.28^*	−0.28^*
Borg	0.35^†	0.33^†	0.45^†	0.47^† ^*	0.40^†	0.40^†	0.45^†	0.46^†
BDI	−0.39^†	−0.42^†	−0.72^†	−0.68^†	−0.61^†	−0.61^†	−0.68^†	−0.67^†
SF-36
PF	−0.43^†	−0.44^†	−0.80^†	−0.79^†	−0.64^†	−0.66^†	−0.73^†	−0.74^†
RP	−0.40^†	−0.38^†	−0.58^†	−0.59^†	−0.58^†	−0.55^†	−0.62^†	−0.60^†
BP	−0.44^†	−0.38^†	−0.46^†	−0.46^†	−0.51^†	−0.51^†	−0.53^†	−0.53^†
GH	−0.47^†	−0.44^†	−0.60^†	−0.59^†	−0.64^†	−0.62^†	−0.67^†	−0.65^†
VT	−0.46^†	−0.41^†	−0.61^†	−0.59^†	−0.61^†	−0.60^†	−0.64^†	−0.63^†
SF	−0.37^†	−0.38^†	−0.58^†	−0.56^†	−0.62^†	−0.62^†	−0.62^†	−0.63^†
RE	−0.25^†	−0.26^†	−0.43^†	−0.44^†	−0.57^†	−0.55^†	−0.52^†	−0.53^†
MH	−0.27^*	−0.24^†	−0.32^†	−0.33^†	−0.45^†	−0.46^†	−0.42^†	−0.43^†
PCS	−0.52^†	−0.49^†	−0.74^†	−0.73^†	−0.63^†	−0.62^†	−0.71^†	−0.71^†
MCS	−0.25^*	−0.24^*	−0.38^†	−0.38^†	−0.55^†	−0.55^†	−0.49^†	−0.50^†

↵* p<0.01.
↵† p<0.0001.
BDI, baseline dyspnoea index; Borg, Borg dyspnoea index; BP, Bodily Pain; FVC%, percentage predicted forced vital capacity; GH, General Health; MCS, Mental Component Summary; MH, Mental Health; 6MWD, distance walked during the six-minute walk test; PCS, Physical Component Summary; PF, Physical Functioning; RE, Role Emotional; RP, Role Physical; SF, Social Functioning; SF-36, Medical Outcomes Study Short-Form 36-Item Instrument; SGRQ, St George's Respiratory Questionnaire; SGRQ-I, IPF-specific version of St George's Respiratory Questionnaire; Tlco%, percentage predicted transfer factor of the lung for carbon monoxide; VT, Vitality.