Table 2 Comparisons of outcomes of interest at baseline and 1–2 year follow-up (1.25 group/ 1.75 group)

Stein

(1995)

NR

NR

NR

NR

NR

NR

NR

NR

17/43 vs 17/43

Johnson

(1996)

33 ± 26.53/19 ± 23.22

35 ± 36.48/19 ± 16.58

2.63 ± 0.1/2.59 ± 0.2

2.50 ± 0.03/2.54 ± 0.23

1.26 ± 0.07/1.24 ± 0.07

1.30 ± 0.27/1.27 ± 0.13

1.57 ± 0.6/1.57 ± 0.56

1.84 ± 0.43/1.61 ± 0.3

12/22 vs 11/23

Sanchez

(2004)

226.2 ± 228/98 ± 90.33

332 ± 188.67/86.7 ± 46.83

9.61 ± 0.92/9.73 ± 0.37

9.92 ± 1.04/10.04 ± 0.49

1.24 ± 0.08/1.25 ± 0.03

1.27 ± 0.03/1.29 ± 0.03

5.65 ± 1.3/5.61 ± 0.88

6.32 ± 1.47/5.49 ± 0.79

NR

Jing (2009)

124.5 ± 16.7/116.1 ± 14.3

191.86 ± 114.71/122.1 ± 104.4

2.78 ± 0.43/2.81 ± 0.51

2.25 ± 1.15/2.75 ± 1.52

NR

NR

2.14 ± 0.35/2.08 ± 0.26

1.61 ± 1.26/1.99 ± 1.71

1/33 vs 1/24

Kang

(2012)

171.9 ± 250.8/166.6 ± 163.4

213.2 ± 147.7/145.2 ± 155.4

2.14 ± 0.16/2.16 ± 0.22

2.12 ± 0.15/2.22 ± 0.13

0.76 ± 0.12/0.78 ± 0.14

0.73 ± 0.06/0.78 ± 0.07

1.18 ± 0.34/1.22 ± 0.39

1.46 ± 0.25/1.44 ± 0.28

NR

Liang

(2014)

31.70 ± 17.57/35.15 ± 18.67

30.88 ± 15.89/24.06 ± 15.21

7.78 ± 1.20/8.08 ± 1.01

8.84 ± 1.19/8.98 ± 0.89

NR

NR

6.50 ± 1.32/6.08 ± 1.88

5.42 ± 0.88/5.74 ± 1.07

NR

Wang

(2016)

33.21 ± 57.62/31.98 ± 52.27

36.68 ± 47.27/33.70 ± 38.34

2.40 ± 0.25/2.28 ± 0.25

2.39 ± 0.26/2.51 ± 0.33

NR

NR

1.89 ± 0.22/1.85 ± 0.46

1.54 ± 0.39/1.68 ± 0.50

NR