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Table 3 Item correlation, inter-item covariance and item alphas

From: The reliability, validity and factorial structure of the Swahili version of the 7-item generalized anxiety disorder scale (GAD-7) among adults living with HIV from Kilifi, Kenya

Item Item–test correlation Item–rest correlation Average inter-item covariance Alphaa
GAD1 0.78 0.68 0.37 0.78
GAD2 0.76 0.65 0.38 0.79
GAD3 0.78 0.68 0.38 0.78
GAD4 0.65 0.51 0.42 0.81
GAD5 0.60 0.44 0.44 0.82
GAD6 0.61 0.46 0.43 0.82
GAD7 0.70 0.58 0.40 0.80
  1. The displayed values are for standardized items
  2. aThe item alpha presented is if the respective item is deleted