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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.