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Table 2 Overall Rasch model fit statistics and reliability of SAQ domainsa

From: Measuring safety climate in acute hospitals: Rasch analysis of the safety attitudes questionnaire

Overall fit statistics SAQ domains
Teamwork climate Safety climate Job satisfaction Stress recognition Perceptions of ward management Perceptions of hospital management Working conditions
Items
 Fit residual (mean)b 0.46 −0.03 −0.44 0.32 0.31 0.15 −0.14
 Fit residual (SD)c 1.65 0.86 2.10 1.49 3.92 4.02 1.17
Persons
 Fit residual (mean)b −0.58 −0.61 −0.52 −0.50 −0.64 −0.98 −0.79
 Fit residual (SD)c 1.37 1.40 1.11 1.13 1.39 1.99 1.37
Total item-trait interaction
 Total item χ 2 70.88 40.35 59.16 41.37 164.61 153.20 14.17
 df 36 42 30 24 36 36 15
p-value 0.00 0.54 0.00 0.02 0.00 0.00 0.51
Person separation indexd 0.71 0.74 0.80 0.73 0.66 0.67 0.61
  1. SD standard deviation, df degrees of freedom
  2. aAs analysed using RUMM2030 (Rumm Laboratory Pty Ltd., Perth) for Windows
  3. bShould be close to 0 [18]
  4. cShould be close to 1 [18]
  5. dRasch based reliability statistic (analogous to Cronbach’s alpha)