Table 4 Variance decomposition of CSBS-ITC item-level scores by risk status and composite

 σ²_Person

0.031

5.93%

0.105

13.78%

0.146

21.28%

0.111

15.77%

 σ²_Age

0.198

37.99%

0.018

2.37%

0.132

19.18%

0.127

18.09%

 σ²_Item

0.051

9.78%

0.345

45.40%

0.093

13.56%

0.149

21.29%

 σ²_Person*Age

0.015

2.84%

0.015

1.98%

0.051

7.39%

0.020

2.84%

 σ²_Person*Item

0.033

6.25%

0.106

13.94%

0.064

9.36%

0.080

11.38%

 σ²_Age*Item

0.055

10.53%

0.006

0.84%

0.015

2.25%

0.025

3.54%

 σ²_Residual

0.139

26.67%

0.165

21.68%

0.185

26.99%

0.191

27.19%

Total variance

0.521

100.00%

0.760

100.00%

0.686

100.00%

0.703

100.00%

 σ²_Person

0.041

6.54%

0.044

10.39%

0.112

15.44%

0.107

14.95%

 σ²_Age

0.373

59.28%

0.002

0.39%

0.196

27.11%

0.279

38.78%

 σ²_Item

0.032

5.07%

0.173

41.10%

0.127

17.59%

0.073

10.22%

 σ²_Person*Age

0.016

2.53%

0.013

3.19%

0.048

6.59%

0.053

7.31%

 σ²_Person*Item

0.004

0.62%

0.066

15.65%

0.050

6.86%

0.039

5.41%

 σ²_Age*Item

0.070

11.12%

0.001

0.27%

0.030

4.10%

0.022

3.03%

 σ²_Residual

0.094

14.85%

0.122

29.01%

0.162

22.31%

0.146

20.29%

Total variance

0.629

100.00%

0.420

100.00%

0.724

100.00%

0.719

100.00%

 σ²_Person

0.018

3.23%

0.120

19.68%

0.077

11.20%

0.074

11.01%

 σ²_Age

0.358

64.49%

0.010

1.61%

0.247

36.08%

0.164

24.33%

 σ²_Item

0.029

5.18%

0.298

48.76%

0.114

16.59%

0.180

26.74%

 σ²_Person*Age

0.005

0.90%

0.001

0.21%

0.022

3.21%

0.012

1.72%

 σ²_Person*Item

0.008

1.53%

0.084

13.72%

0.046

6.70%

0.066

9.77%

 σ²_Age*Item

0.069

12.42%

0.014

2.34%

0.054

7.93%

0.068

10.08%

 σ²_Residual

0.068

12.25%

0.084

13.67%

0.125

18.29%

0.110

16.34%

Total variance

0.556

100.00%

0.612

100.00%

0.685

100.00%

0.672

100.00%