Table 5 Descriptive statistics for both the development and validation datasets

development sample

 3

58

7.60

1.62

3.08

10

5.00

6.92

8.85

 4

60

7.52

2.02

3.08

10

4.42

6.54

9.23

 5

43

8.28

1.53

4.62

10

5.77

7.31

9.62

 6

30

8.68

1.60

2.69

10

6.92

8.08

9.62

 overall

191

7.90

1.78

2.69

10

5.00

6.92

9.23

validation sample

 3

46

7.26

2.31

2.08

10

3.75

5.83

9.58

 4

65

8.26

1.84

2.08

10

5.83

7.50

9.58

 5

55

8.44

1.98

2.08

10

5.42

7.50

10

 6

18

8.96

1.36

5.42

10

7.50

7.92

10

 overall

184

8.13

2.03

2.08

10

5.42

7.08

10