Table 4 Meta-analysis of risk factors for postoperative delirium after head and neck cancer surgery
Risk factors | Number of studies | Pooled OR | Lower 95% CI | Upper 95% CI | P-value | I2 (%) | Statistical method |
|---|---|---|---|---|---|---|---|
Age | 5 | 1.05 | 1.03 | 1.07 | < 0.001 | 18 | Fixed |
Age > 75 years | 2 | 6.52 | 3.07 | 13.87 | < 0.001 | 0 | Fixed |
Male gender | 5 | 2.29 | 1.06 | 4.97 | 0.04 | 55 | Random |
ASA states | 3 | 2.19 | 1.44 | 3.33 | < 0.001 | 31 | Fixed |
ICU stay | 2 | 2.08 | 0.46 | 9.46 | 0.34 | 93 | Random |
Operative time | 3 | 1.00 | 1.00 | 1.01 | 0.003 | 0 | Fixed |
History of smoking | 2 | 2.74 | 1.13 | 6.65 | 0.03 | 0 | Fixed |
Diabetes mellitus | 3 | 2.73 | 1.24 | 6.01 | 0.01 | 0 | Fixed |