Table 1

Item responses, item scores, reliability and validity of ESS
Item Response Item score Cronbach's α Factor analysis
n % Median (Q1,Q3) Mean (SD)
ESS1 3025 94.12 1(0,2) 0.99(1.09) 0.78* 0.57
ESS2 3187 99.16 1(0,2) 0.99(1.07) 0.78* 0.55
ESS3 3169 98.60 0(0,1) 0.70(0.94) 0.77* 0.68
ESS4 3174 98.76 1(0,2) 0.96(1.08) 0.76* 0.69
ESS5 3143 97.79 2(0,2) 1.48(1.14) 0.79* 0.53
ESS6 3204 99.69 0(0,0) 0.15(0.48) 0.80* 0.44
ESS7 3190 99.25 0(0,2) 0.86(1.03) 0.77* 0.61
ESS8 3086 96.02 0(0,1) 0.69(0.97) 0.78* 0.61
Total 2906 90.42 6(3,10) 6.75(5.11) 0.80

* Cronbach's α,if the item was deleted.

Wu et al.

Wu et al. BMC Public Health 2012 12:849   doi:10.1186/1471-2458-12-849

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