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Table 4 Revised thresholds and response categories for the Symptom domain of the SGRQ

From: A psychometric assessment of the St. George’s respiratory questionnaire in patients with COPD using rasch model analysis

  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