Table 2 Comparison of shortening between between three groups

Shortening distance(1 day, mm)

(\(\:\stackrel{-}{\text{x}}\)±s)

0.6 ± 0.1

1.2 ± 0.3

1.4 ± 0.3

Shortening distance(3 month, mm)

(\(\:\stackrel{-}{\text{x}}\)±s)

2.2 ± 0.2

3.5 ± 0.5

4.5 ± 0.7

Shortening distance(6 months, mm)

(\(\:\stackrel{-}{\text{x}}\)±s)

2.4 ± 0.3

3.7 ± 0.6

4.7 ± 0.7

Shortening distance(1 year, mm)

(\(\:\stackrel{-}{\text{x}}\)±s)

2.4 ± 0.3

3.8 ± 0.6

4.8 ± 0.7

Shortening grading(1 year)

Mild(>0,≤5 mm)

48 (98.0%)

41 (83.7%)

34 (69.4%)

Moderate(>5-≤10 mm)

1 (2.0%)

5 (10.2%)

6 (12.2%)

Severe(>10 mm)

0 (0%)

3 (6.1%)

9 (18.4%)