Table 3 The preparation and surgery time of four practice courses for three groups (Mean ± SD)

1–3 times

2.96 ± 0.19

2.99 ± 0.27

3.54 ± 0.38

0.004

Group 1 < Group 3

Group 2 < Group 3

4.87 ± 0.66

4.67 ± 0.86

6.96 ± 0.72

< 0.001

Group 1 < Group 3

Group 2 < Group 3

4–6 times

2.86 ± 0.20

2.79 ± 0.29

3.24 ± 0.35

0.029

Group 2 < Group 3

4.15 ± 0.45

3.80 ± 0.55

6.10 ± 0.51

< 0.001

Group 1 < Group 3

Group 2 < Group 3

7–9 times

2.78 ± 0.10

2.62 ± 0.13

3.09 ± 0.25

0.001

Group 1 < Group 3

Group 2 < Group 3

3.93 ± 0.56

4.25 ± 0.96

5.61 ± 0.82

< 0.001

Group 1 < Group 3

Group 2 < Group 3

10–12 times

2.76 ± 0.14

2.62 ± 0.13

3.04 ± 0.16

< 0.001

Group 1 < Group 3

Group 2 < Group 3

3.63 ± 0.58

4.22 ± 0.88

5.20 ± 0.69

< 0.001

Group 1 < Group 3

Group 2 < Group 3

p value^a

0.143

0.022

0.034

< 0.001

0.029

< 0.001

Multiple mean comparisons^b

NS

1–3 times > 7–9 times

1–3 times > 10–12 times

1–3 times > 10–12 times

1–3 times > 4–6 times

1–3 times > 7–9 times

1–3 times > 10–12 times

NS

1–3 times > 4–6 times

1–3 times > 7–9 times

1–3 times > 10–12 times

4–6 times > 10–12 times