Table 4 Revised thresholds and response categories for the Symptom domain of the SGRQ
Thresholds between response categories (logits) | |||
|---|---|---|---|
Item | “Most days”/“several days” | “Several days”/“only with infection” | “Only with infection”/“not at all” |
S_a1 | 0.14 | 0.87 | 1.53 |
S_a2 | 0.13 | 0.86 | 1.51 |
S_a3 | –0.43 | 0.30 | 0.96 |
S_a4 | –0.82 | –0.09 | 0.57 |
Item | 3 or more attacks/1 or 2 attacks | 1 or 2 attacks/no attacks | |
S_a5 | –3.88 | –0.93 | |
Item | no days/some or a few days | some or a few days/every day | |
S_a7 | –1.07 | 2.19 | |