Table 2. Statistical analysis of RLN palsy rates for single-level and two-level ACDF procedures.
| Author & year | Two-level ACDF | Single-level ACDF | OR | 95% CI | Weight (%) | |||
|---|---|---|---|---|---|---|---|---|
| Event | Total | Event | Total | |||||
| Fountas et al., 2007 | 12 | 363 | 14 | 473 | 1.12 | 0.51–2.45 | 63.6 | |
| Kilburg et al., 2006 | 3 | 87 | 5 | 331 | 2.33 | 0.55–9.94 | 18.5 | |
| Nanda et al., 2014 | 0 | 523 | 2 | 1,026 | 0.39 | 0.02–8.17 | 4.2 | |
| Yang et al., 2016 | 2 | 41 | 2 | 74 | 1.85 | 0.25–13.62 | 9.8 | |
| Lied et al., 2008 | 1 | 148 | 0 | 240 | 4.89 | 0.20–120.86 | 3.8 | |
| Overall | 18 | 1,162 | 23 | 2,144 | 1.36 | 0.73–2.55 | 100 | |
RLN, recurrent laryngeal nerve; ACDF, anterior cervical discectomy and fusion; SD, standard deviation; OR, odds ratio; CI, confidence interval.