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These three items were summed together to form an additive index that had an alpha value of .63.
These two items were summed together to form an additive index that had an alpha value of .72.
These four items were summed together to form an additive index that had an alpha value of .79.
All the indices, except one, had a Cronbach's alpha value higher than .60, a reliability level that is generally viewed as acceptable (Gronlund, 1981).
The one index that scored below .60 was only one of two proxy measures of the same construct, and its alpha value, at .55, was just below the threshold normally used.
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