Table 1 Patient Demographics by Study
Study | Study Design | Country | No. of each intervention group | Age (yr) | Gender (% male) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Posterior | Combined | Total | Posterior | Combined | Total | Posterior | Combined | Total | |||
Zheng 2013 [16] | RCS | China | 12 | 14 | 26 | NR | NR | NR | NR | NR | NR |
Been 1999 [13] | RCS | The Netherlands | 19 | 27 | 46 | 33.7 ± 13.1 | 26.8 ± 8.6 | NR | 19 | 55 | 56 |
Danisa 1995 [14] | RCS | USA | 27 | 6 | 33 | 37.7 | 36.8 | NR | 70.4 | 66.7 | 69.7 |
Defino 2007 [20] | RCS | Brazil | 18 | 6 | 24 | 35.36 ± 8.3 | 37.6 | NR | 94.4 | 66.7 | 87.5 |
Gumussuyu 2019 [15] | RCT | Turkey | 13 | 14 | 27 | 40.07 ± 10.3 | 40 ± 10.3 | 38.5 ± 2.4 | 76.9 | 64.3 | 70.4 |
Lukas 2007 [17] | PCS | Czech Republic | 20 | 22 | 42 | NR | NR | 42 | NR | NR | 65 |
Muratore 2021 [18] | RCS | Italy | 96 | 5 | 101 | NR | NR | 47.8 ± 15.7 | NR | NR | 71.2 |
Wang 2015 [19] | RCT | China | 23 | 21 | 44 | 40.5 ± 13.5 | 41.2 ± 12.9 | NR | NR | NR | 68.2 |