Table 1 Characteristics of the included studies
Study (Year) | Study Design | Country | Group (BMI) | Mean BMI (range), kg/m2 | Sex (M/F) | Number | Mean Age (range), years | Operation level | Mean follow-up (range), months |
|---|---|---|---|---|---|---|---|---|---|
Bae 2016[16] | Retrospective | Korea | Obese (≥ 30) | 32.9 (30.1–38.9) | 14/7 | 21 | 37.8 (20–60) | L2–3(2); L3–4(1); L4–5(13); L5–S1(5) | 28.3 (24–43) |
Non-obese (18.5–22.9) | 20.8 (19.2–22.8) | 12/15 | 27 | 38.1 (17–75) | L4–5(21); L5–S1(6) | ||||
Kapetanakis 2018[17] | Retrospective | Greece | Obese (≥ 40) | 45.8 ± 4.5 | 8/12 | 20 | 57.3 ± 1.8 | L3–4(1); L4–5(13); L5–S1(6) | 24 |
Non-obese (19.7–21.9) | 20.8 ± 1.1 | 6/4 | 10 | 57.5 ± 1.8 | L4–5(7); L5–S1(3) | ||||
Yu 2021[18] | Retrospective | China | Obese (≥ 30) | NR | 24/4 | 28 | 18.07 ± 2.21 | L4–5(21); L5–S1(6);Other level (1) | 27.75 ± 15.40 (12–70) |
Non-obese (< 30) | NR | 66/14 | 80 | 18.16 ± 2.61 | L4–5(50); L5–S1(28); Other level (2) | 29.71 ± 16.45 (12–70) | |||
Zhu 2021[19] | Retrospective | China | Obese (≥ 30) | NR | NR | 30 | NR | NR | 12 |
Non-obese (18.5–22.9) | 42 |