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. 2017 Apr 20;17:343. doi: 10.1186/s12889-017-4259-y

Table 4.

Domain Statistics

Domain Number of items Mean (%) SD (%) Range Cronbach’s Alpha
Background (/35) 5 18.39 (52.54) 5.67 (18.90) 8-30 0.58
Sources (/18) 3 8.89 (49.39) 4.25 (23.61) 0-18 0.49
Results (/18) 3 11.96 (66.44) 2.26 (12.56) 4-18 0.71
Context (/18) 3 9.91 (55.06) 4.44 (24.67) 0-18 0.55
Validity (/18) 3 2.71 (15.06) 4.43 (24.61) 0-16 0.86

The italicized figures indicate item-total correlation coefficients outside the accepted range