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Table 4 Asthma questionnaire’s reliability analysis, item-total statistics

From: The reliability and validity of the Turkish version of the school-based asthma and allergy screening questionnaires

Asthma SQ Scale Mean if Item Deleted Scale Variance if Item Deleted Corrected Item-Total Correlation Cronbach’s Alpha if Item Deleted
Item 1 2.81 5.264 0.451 0.686
Item 2 2.78 5.309 0.374 0.701
Item 3 2.51 4.844 0.449 0.684
Item 4 2.21 4.710 0.380 0.710
Item 5 2.79 5.047 0.485 0.677
Item 6 2.90 5.328 0.442 0.689
Item 7 2.58 4.799 0.493 0.672
Asthma PQ     
Item 1 2.09 5.769 0.593 0.774
Item 2 2.06 5.602 0.576 0.774
Item 3 1.89 5.379 0.533 0.781
Item 4 1.77 5.498 0.395 0.811
Item 5 2.00 5.526 0.580 0.773
Item 6 2.17 6.022 0.558 0.781
Item 7 1.95 5.363 0.584 0.772
Item 8 2.18 6.299 0.441 0.795
  1. Cronbach α value of the asthma SQ (student questionnaire) and PQ (parent / guardian questionnaire) were 0.721 and 0.805 respectively