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. 2021 Sep 23;18(19):10020. doi: 10.3390/ijerph181910020

Table 2.

Condensed REST and Comprehensive REST Comparison.

Variable Number of Items Cronbach’s Alpha Mean Standard Deviation Median Minimum Maximum Spearman’s Correlation with Comprehensive Version
Quantity Scale (n = 336)
Condensed Version 9 0.92 a 3.98 0.77 4.07 1.33 5.0 0.97 (p < 0.001)
Comprehensive Version 32 0.97 a 3.92 0.74 4.04 1.51 5.0 ---
Quality Scale (n = 332)
Condensed Version 9 0.94 a 3.72 0.92 3.86 1 5 0.97 (p < 0.001)
Comprehensive Version 32 0.98 a 3.69 0.89 3.84 1 5 --

a No items increase alpha if dropped.