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Table 4 Subgroup analysis of heterogeneity sources

From: Clinicopathological and prognostic significance of PD-L1 expression in colorectal cancer: a systematic review and meta-analysis

 

No. of studies

HR

95%CI

P value

Heterogeneity (I2), %

Country

Asian

6

1.73

1.10–2.73

0.02

60

Non-Asian

4

0.93

0.89–0.97

0.001

12

Stages

I–IV

5

1.32

1.06–1.63

0.01

52

Follow-up period

≥ 5 years

4

1.12

0.94–1.34

0.20

65

< 5 years

6

1.62

0.93–2.82

0.09

61

Postoperative adjuvant chemotherapy

4

1.61

0.88–2.94

0.12

54

Sample size

≥ 200

5

1.09

0.92–1.28

0.32

54

< 200

5

1.61

0.99–2.60

0.05

47