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Table 2 Summary of subgroup analysis by ethnicity

From: Survivin protein expression is involved in the progression of non-small cell lung cancer in Asians: a meta-analysis

Studies Ethnicity (n) Studies (n) Combined RR (95 % CI) P(Z) I2 P(Q)
NSCLC vs. Control All 19 7.16(4.63-11.07) <0.001 58.1 % 0.001
  Asians 18 6.60(4.33-10.05) <0.001 55..4 % 0.002
  Caucasians 1 101(6.34-1608) 0.001 / /
Squamous cell carcinoma vs. Adenocarcinoma All 22 1.00(0.93, 1.07) 0.983 7.0 % 0.367
  Asians 19 0.97(0.90-1.05) 0.44 0 % 0.189
  Caucasians 3 1.01(0.78-1.30) 0.959 40.0 % 0.515
Well/Moderately differentiated vs. Poor differentiated All 21 0.80(0.73-0.87) <0.001 45.4 % 0.013
  Asians 20 0.78(0.72-0.86) <0.001 33 % 0.077
  Caucasians 1 0.96(0.86-1.08) 0.487 / /
TNMI/II stage vs. TNM III/IVstage All 26 0.75(0.67-0.84) <0.001 72.7 % <0.001
  Asians 22 0.74(0.65-0.84) <0.001 71.4 % <0.001
  Caucasians 4 0.89(0.75-1.07) 0.222 39 % 0.178
Lymph node metastasis vs. Non lymph node metastasis All 25 1.14(1.01-1.29) 0.035 71.5 % <0.001
  Asians 22 1.16(1.01-1.34) 0.037 72.7 % <0.001
  Caucasians 3 1.03(0.80-1.32) 0.839 64.2 % 0.061
Small Tumor vs. Big Tumor All 11 0.95(0.86-1.05) 0.336 18.1 % 0.272
  Asians 9 0.98(0.85-1.13) 0.796 31 % 0.171
  Caucasians 2 0.90(0.78-1.04) 0.161 0 % 0.729