Table 2

Principal components analysis with varimax rotation of the 12-item set

Item	Component 1 “Physical”	Component 2 “Affect”
My breath does not go in all the way	0.811
My breathing requires more work	0.715	0.333
I feel short of breath	0.713	0.313
I have difficulty catching my breath	0.696	0.320
I cannot get enough air	0.688	0.398
My breathing is uncomfortable	0.653	0.456
My breathing is exhausting	0.578	0.479
My breathing makes me feel depressed		0.834
My breathing makes me feel miserable		0.821
My breathing is distressing	0.357	0.725
My breathing makes me agitated	0.488	0.658
My breathing is irritating	0.508	0.530

Items were allocated to a component if they loaded >0.5, as per figures highlighted in bold.