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Table 2 Internal consistency and concurrent validity of SGRQ-I

From: Validation of the IPF-specific version of St. George’s Respiratory Questionnaire

SGRQ-I Cronbach’s α ICC
Total 0.92 0.97
Symptoms 0.77 0.78
Activities 0.86 0.94
Impacts 0.84 0.96
  1. Data are presented as Cronbach’s alpha and intraclass correlation coefficients (ICC) of the total and three domain scores of SGRQ-I compared to SGRQ for all patients. SGRQ-I: IPF-specific version of the St. George’s Respiratory Questionnaire