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Table 6 Model fit and nested model comparisons for multiple group CFA analyses

From: Validation of the WHOQOL-Bref: psychometric properties and normative data for the Norwegian general population

Multiple group CFA Model fit indices Nested model comparison P-value χ2/df
χ2 (df) RMSEA SRMR Comparison χ2 (df) test for difference
Gender        
 Women (n = 344) 632.18 (243) 0.068 0.062     
 Men (n = 297) 521.71 (243) 0.062 0.058     
 Model 1 (all parameters free) 1155.42 (486) 0.066 0.060     
 Model 2 (constrained factor loadings) 1151.52 (506) 0.063 0.060 Model 2 versus 1 31.679 (20) .047 1.58
 Model 3 (constrained factor loadings and thresholds) 1185.97 (550) 0.060 0.061 Model 3 versus 2 71.99 (44) .049 1.64
Age        
 18–39 (n = 187) 325.59 (243) 0.043 0.059     
 40–59 (n = 218) 467.48 (243) 0.065 0.065     
 60–75 (n = 224) 511.33 (243) 0.070 0.066     
 Model 1 (all parameters free) 1293.64 (729) 0.061 0.063     
 Model 2 (constrained factor loadings) 1314.23 (769) 0.058 0.064 Model 2 versus 1 59.82 (40) .023 1.50
 Model 3 (constrained factor loadings and thresholds) 1487.83 (857) 0.059 0.066 Model 3 versus 2 231.95 (88) .000 2.64
Education        
 No post-secondary
 Education (n = 351)
620.65 (243) 0.067 0.060     
 Post secondary
 Education (n = 284)
499.06 (243) 0.061 0.060     
 Model 1 (all parameters free) 1117.94 (486) 0.064 0.060     
 Model 2 (constrained factor loadings) 1113.24 (506) 0.061 0.060 Model 2 versus 1 32.08 (20) .043 1.60
 Model 3 (constrained factor loadings and thresholds) 1154.15 (550) 0.059 0.061 Model 3 versus 2 76.82 (44) .002 1.75