Table 4 Meta-regression results of the prevalence of pneumonia after radical gastrectomy for gastric cancer

Gender

0.0105

− 0.2433–0.2643

0.1295

0.9354

Age

0.0563

− 0.0810–0.1935

0.0700

0.4217

Surgical approach

− 0.0339

− 0.2323–0.1645

0.1012

0.7376

Types of gastrectomy

− 0.1189

− 0.4453–0.2074

0.1665

0.4751

Nasogastric tube retention time

0.0246

− 0.2786–0.3277

0.1547

0.8738

Intraoperative blood loss

0.0737

− 0.0695–0.2169

0.0737

0.3131

Operation duration

− 0.1447

− 0.3289–0.0394

0.0939

0.1234

Country

0.0564

− 0.0134–0.1264

0.0357

0.1131

Years

0.0142

0.0055–0.0230

0.0045

0.0015

Study design

0.0383

− 0.0708–0.1473

0.0556

0.4913