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Table 5 Multi-trait analysis with Pearson, Spearman, polychoric and polyserial correlations †

From: Development and preliminary validation of a questionnaire to measure satisfaction with home care in Greece: an exploratory factor analysis of polychoric correlations

Scale/Item    Item - Scale Correlations  
Socio-Economic Change Mean SD Socio-Economic Change Staff Skills & Attitudes Service Appropriateness Service Planning Scaling Success§
2 3.75 0.980 0.614‡ 0.508 0.463 0.154 3
    (0.522)‡ (0.423) (0.439) (0.081)  
    [0.609]‡ [0.494]¶ [0.506] [0.144]  
4 3.86 1.096 0.718‡ 0.48 0.336 0.177 3
    (0.693)‡ (0.435) (0.335) (0.139)  
    [0.762]‡ [0.483] [0.390] [0.194]  
10 3.83 0.977 0.675‡ 0.565 0.493 0.277 3
    (0.662)‡ (0.463) (0.472) (0.236)  
    [0.724]‡ [0.556] [0.547] [0.292]  
24 4.11 1.096 0.659‡ 0.445 0.379 0.197 3
    (0.573)‡ (0.487) (0.398) (0.131)  
    [0.683]‡ [0.476] [0.456] [0.199]  
Staff Skills & Attitudes        
3 4.49 0.901 0.487 0.678‡ 0.458 0.133 3
    (0.416) (0.504)‡ (0.291) (0.065)  
    [0.544] [0.674]‡ [0.421] [0.114]  
5 4.1 1.054 0.482 0.700‡ 0.404 0.202 3
    (0.463) (0.609)‡ (0.321) (0.140)  
    [0.519] [0.688] ‡ [0.403] [0.195]  
23 4.18 0.917 0.486 0.695‡ 0.415 0.325 3
    (0.397) (0.615)‡ (0.287) (0.275)  
    [0.497] [0.709]‡ [0.386] [0.352]  
28 4.44 0.893 0.496 0.671‡ 0.500 0.261 3
    (0.424) (0.601)‡ (0.327) (0.147)  
    [0.539] [0.726]‡ [0.453] [0.257]  
29 4.04 0.940 0.500 0.690‡ 0.536 0.195 3
    (0.414) (0.570)‡ (0.498) (0.130)  
    [0.503] [0.687]‡ [0.579] [0.199]  
Service Appropriateness        
15 4.23 1.076 0.414 0.495 0.612‡ 0.060 3
    (0.390) (0.354) (0.447)‡ (0.018)  
    [0.448] [0.472] [0.636]‡ [0.050]  
20 4.25 0.944 0.501 0.519 0.612‡ 0.229 3
    (0.434) (0.395) (0.447)‡ (0.132)  
    [0.522] [0.494] [0.636]‡ [0.227]  
Service Planning        
11 2.7 1.036 0.199 0.202 0.076 0.353‡ 3
    (0.156) (0.122) (0.024) (0.280)‡  
    [0.219] [0.219] [0.052] [0.375]‡  
30 3.26 0.930 0.204 0.256 0.185 0.353‡ 3
    (0.102) (0.163) (0.112) (0.280)‡  
    [0.209] [0.275] [0.163] [0.375]‡  
  1. † Spearman correlation coefficients are shown in parentheses. ‡ Item-total correlation corrected for overlap. § Number of correlation comparisons in which the item-scale correlation was found to be significantly higher for hypothesized scale than for competing scale. Significance level was set at 5%. In brackets polychoric or polyserial correlations were computed, according to whether one of the two variables to be correlated had more than 15 categories and could thus be treated as continuous.
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