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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