Table 7.

Correlation analysis (Spearman) between each item score and the total score on the relevant domain

Scale	I1	I2	I3	I4	I5	I6	I7	I8	I9
SRI-RC	0.59	0.70	0.51	0.70	0.65	0.55	0.52	0.47
SRI-PF	0.72	0.85	0.76	0.85	0.82	0.36
SRI-AS	0.54	0.55	0.54	0.71	0.44	0.54	0.51
SRI-SR	0.76	0.76	0.64	0.82	0.67	0.63
SRI-AX	0.80	0.77	0.78	0.84	0.78
SRI-WB	0.79	0.73	0.79	0.65	0.73	0.66	0.67	0.65	0.61
SRI-SF	0.76	0.63	0.52	0.83	0.80	0.54	0.65	0.77

Note: p-values were all <0.05.

Abbreviations: I, Item; SRI, Severe Respiratory Insufficiency Questionnaire; RC, respiratory complaints; PF, physical functioning; AS, attendant symptoms and sleep; SR, social relationships; AX, anxiety; WB, psychological well-being; S F, social functioning.