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Table 2 Results of sensitivity analysis

From: Perioperative blood transfusion adversely affects prognosis after resection of lung cancer: a systematic review and a meta-analysis

Outcome

No. of studies

RR (95% CI)

P value

I2(%)

HG p value

Patients with stage I disease

     

  OS

5 [6, 14, 18, 21, 22]

1.39 (1.03, 2.02)

0.02

66

0.02

  RFS

5 [2, 5–7, 14, 22]

1.51 (1.14, 2.01)

0.005

60

0.03

High-quality studies

     

  OS

6 [6, 8, 13, 14, 22, 23]

1.58 (1.19, 2.08)

0.001

61

0.02

  RFS

6 [6, 8, 13, 14, 22, 23]

1.52 (1.14, 2.01)

0.004

57

0.04

Studies with >200 patients

     

  OS

12 [6, 9, 13–18, 20–23]

1.26 (1.12, 1.41)

< 0.001

66

< 0.001

  RFS

7 [6, 7, 13, 14, 19, 22, 23]

1.41 (1.13, 1.75)

0.002

61

0.02

  1. RR, Relative risk ratio; HG, Heterogeneity; OS, Overall survival; RFS, Recurrence-free survival.