Table 3 Subgroup analysis of the prevalence of pneumonia after radical gastrectomy for gastric cancer

Gender

1.6587

0.0972

 Male

26

94.1%

< 0.001

Random

13.71

(9.94–17.49)

 Female

26

89.5%

< 0.001

Random

9.42

(6.03–12.81)

Age

2.5522

0.0107

 ≥ 60

24

92.8%

< 0.001

Random

17.9

(11.93–22.26)

 < 60

20

93.7%

< 0.001

Random

9.0

(5.54–12.46)

Surgical approach

1.8745

0.0609

 Open surgery

11

94.8%

< 0.001

Random

13.07

(7.49–18.64)

 Laparoscopic surgery

16

93.6%

< 0.001

Random

7.30

(4.99–9.60)

Types of gastrectomy

1.1048

0.2692

 Total gastrectomy

19

88.3%

< 0.001

Random

13.64

(8.64–18.63)

 Partial gastrectomy

20

93.4%

< 0.001

Random

9.90

(5.54–14.26)

Nasogastric tube retention time

2.0762

0.0379

 ≥ 4 days

9

92.5%

< 0.001

Random

31.25

(13.84–48.65)

 < 4 days

9

89.8%

< 0.001

Random

12.03

(6.92–17.15)

Intraoperative blood loss

2.5036

0.0123

 ≥ 200 ml

20

91.7%

< 0.001

Random

15.84

(9.86–21.83)

 < 200 ml

21

92.8%

< 0.001

Random

7.36

(4.47–10.24)

Operation duration

1.8186

0.069

 ≥ 200 min

21

90.7%

< 0.001

Random

16.62

(10.32–22.93)

 < 200 min

23

93.4%

< 0.001

Random

9.93

(6.44–13.43)

Country

2.8642

0.0910

 China

19

96.4%

< 0.001

Random

12.98

(8.86–17.11)

 Japan

8

91.4%

< 0.001

Random

7.34

(2.26–12.42)

Years

7.0621

0.0079

 ≥ 2020

14

96.4%

< 0.001

Random

7.03

(9.81–20.86)

 < 2020

13

94.8%

< 0.001

Random

15.33

(4.39–9.67)

Study design

0.1354

0.7197

 Cohort study

24

95.6%

< 0.001

Random

10.89

(7.89–13.89)

 Case Control

3

97.1%

< 0.001

Random

15.40

(2.11–39.86)