Table 4 Inter-group baseline comparison by each evaluative index

SBS scale scores

47.8

10.3

50.5

7.6

1.2

61

0.25

 ≤ 5 years

41.8

6.7

48.9

4.6

2.6

19

0.02

 6 or more years

51.9

10.4

51.0

8.4

0.3

40

0.77

SS scale scores

74.2

11.0

74.6

8.9

0.2

61

0.22

 ≤ 5 years

71.9

13.8

72.3

11.6

0.6

19

0.96

 ≥ 6 years

75.8

9.2

75.5

7.9

1.4

40

0.89

 K-S test scores

44.8

12.0

45.7

12.0

0.3

61

0.93

 ≤ 5 years

42.6

11.1

49.6

7.5

0.9

19

0.36

 ≥ 6 years

46.3

12.7

45.2

13.3

0.3

40

0.79