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CD-RISC mean item correlation was 0.61 (SD 0.13) [ 24].
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The mean item to item correlation was.21 and ranged from –.32 to.32.32
Some authors claim that values between 0.2 and 0.4 are optimal [ 35], while others argue that a mean inter item correlation consistently above 0.70, may indicate redundancy [ 36].
Removing the item led to a marked improvement in the psychometric properties of the subscale: α = .63, the mean inter-item correlation reached.36 and the mean item-whole correlation = .44.44
Item-total correlation coefficients (excluding the same item in the total score), mean inter-item polychoric correlations, and mean item-total correlations (excluding the same item) were also used to assess the internal consistency.
Our analysis revealed a mean item-subscale correlation of 0.481 ± 0.250 and a mean item-total correlation of 0.292 ± 0.141.
Upper and lower limits of mean inter item correlations are a matter of discussion.
In the present article, we consider mean inter item correlations between 0.2 and 0.7 as satisfactory.
The mean item-total correlation was 0.50 (ranging from 0.37 to 0.59).
Mean inter item correlations varied from 0.32 ("Physical ability") to 0.55 ("Inner strengths").
The mean item-total correlation was 0.48 for the whole sample (0.41 for boys and 0.48 for girls).
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