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Table 6 The top best models by ΔAICc < 4 fitted to VE against severe COVID-19 outcomes

From: Real-world effectiveness and factors associated with effectiveness of inactivated SARS-CoV-2 vaccines: a systematic review and meta-regression analysis

Model

Factors

AICc

ΔAICc

R2 (%)

1

Study region + VOC + population type + age range + vaccine doses + study design

169.355

0.000

56.9

2

Study region + population type + age range + vaccine doses + study design

172.438

3.083

46.7

3

Study region + vaccine brand + age range + vaccine doses + study design

172.552

3.197

45.3