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Table 1 Results of item scaling tests and reliability estimates for SF-36 scales.

From: The validity of the SF-36 in an Australian National Household Survey: demonstrating the applicability of the Household Income and Labour Dynamics in Australia (HILDA) Survey to examination of health inequalities

   Range of item correlations  
  No. of items Item-internal consistency1 Item-discriminant validity2 Scale Reliability3
SF-36 scale     
Physical Functioning 10 0.55 – 0.81 0.14 – 0.55 0.93
Role Physical 4 0.76 – 0.81 0.24 – 0.60 0.90
Bodily Pain 2 0.80 0.32 – 0.67 0.87
General Health 5 0.47 – 0.77 0.22 – 0.57 0.82
Vitality 4 0.63 – 0.67 0.24 – 0.59 0.83
Social Functioning 2 0.71 0.42 – 0.60 0.83
Role Emotional 3 0.68 – 0.72 0.27 – 0.54 0.83
Mental Health 5 0.54 – 0.69 0.15 – 0.57 0.82
  1. 1 Correlations between items and scale corrected for overlap.
  2. 2 Correlations between items and other scales.
  3. 3 Internal-consistency reliability (cronbach's alpha).