Correlation analysis (Spearman) between the score of each item and the total score of the relevant subscale
| I1 | I2 | I3 | I4 | I5 | I6 | I7 | I8 | I9 | |
| SRI-RC | 0.70 | 0.74 | 0.43 | 0.71 | 0.67 | 0.40 | 0.46 | 0.56 | |
| SRI-PF | 0.81 | 0.85 | 0.82 | 0.68 | 0.73 | 0.43 | |||
| SRI-AS | 0.60 | 0.52 | 0.52 | 0.67 | 0.60 | 0.66 | 0.61 | ||
| SRI-SR | 0.75 | 0.79 | 0.70 | 0.70 | 0.80 | 0.66 | |||
| SRI-AX | 0.82 | 0.72 | 0.85 | 0.85 | 0.86 | ||||
| SRI-WB | 0.77 | 0.68 | 0.80 | 0.80 | 0.79 | 0.76 | 0.82 | 0.79 | 0.83 |
| SRI-SF | 0.72 | 0.66 | 0.72 | 0.84 | 0.66 | 0.83 | 0.66 | 0.82 |
p Values all <0.05.
I, item; SRI-AX, anxiety; SRI-AS, attendant symptoms and sleep; SRI-PF, physical functioning; SRI-RC, respiratory complaints; SRI-SF, social functioning; SRI-SR, social relationships; SRI-WB, psychological well-being.