Table 2 Pooled outcomes of all factors
Factors | No. of studies | Statistical model | MD/OR | 95%CI | P vaule | Heterogeneity |
|---|---|---|---|---|---|---|
Male | 12 | random-effects | 1.86 | 1.60–2.17 | < 0.00001 | P = 0.03, I2 = 48% |
Age | 6 | fixed-effects | 4.92 | 4.28–5.56 | < 0.00001 | P = 0.74, I2 = 0% |
Graves Disease | 8 | fixed-effects | 1.81 | 1.60–2.05 | < 0.00001 | P = 0.21, I2 = 28% |
Hypertension | 4 | random-effects | 2.27 | 1.43–3.60 | 0.0005 | P < 0.00001, I2 = 92% |
Antithrombotic Drug used | 6 | fixed-effects | 1.92 | 1.51–2.44 | < 0.00001 | P = 0.20, I2 = 32% |
Low-volume hospital | 5 | random-effects | 1.32 | 1.12–1.57 | 0.001 | P = 0.0001, I2 = 83% |
Previous thyroid surgey | 7 | random-effects | 1.93 | 1.11–3.37 | 0.02 | P = 0.003, I2 = 69% |
Bilateral thyroidectomy | 7 | fixed-effects | 1.19 | 1.09–1.30 | < 0.0001 | P = 0.12, I2 = 40% |
Neck dissection | 6 | random-effects | 1.55 | 1.23–1.94 | 0.0002 | P = 0.09, I2 = 48% |
Smoking status | 4 | random-effects | 1.19 | 0.99–1.42 | 0.06 | P = 0.02, I2 = 71% |
Malignant tumor | 12 | random-effects | 1.00 | 0.83–1.20 | 0.97 | P = 0.0007, I2 = 66% |
Drainage used | 6 | random-effects | 2.02 | 0.69–5.89 | 0.20 | P < 0.00001, I2 = 86% |