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Table 2 Subgroup analyses by subtypes of human papillomavirus

From: Human papillomavirus infection and risk of breast cancer: a meta-analysis of case-control studies

Types Sub-group   Numbers I-squared (%) SOR with 95 % CI by REM
Any    22 44.7 4.02 [2.42–6.68]
  Nationality of subjects Far-East 10 16.4 2.60 [1.25–5.38]
   Middle-East 5 66.4 7.04 [2.43–20.42]
   America 5 59.2 4.23 [1.06–16.84]
   Europe & Oceania 2 0.0 4.39 [1.77–10.86]
  Specimen types PET 15 45.4 5.60 [2.79–11.25]
   FFT 7 47.5 2.61 [1.22–5.61]
  Year of publication −2010 9 0.0 5.10 [2.89–8.99]
   2011- 13 60.1 3.55 [1.68–7.50]
16    11 32.5 5.67 [2.21–14.52]
  Nationality of subjects Far-East 3 0.0 12.37 [2.83–54.15]
   Middle-East 4 0.0 7.87 [1.76–35.23]
   America 4 54.3 3.58 [0.61–21.03]
  Specimen types PET 9 25.9 4.25 [1.57,11.54]
   FFT 2 0.0 16.47 [2.94–92.18]
  Year of publication −2010 5 0.0 12.47 [3.73–41.71]
   2011- 6 30.1 3.25 [0.97–10.87]
18    10 0.0 2.97 [1.64–5.38]
  Nationality of subjects Far-East 3 0.0 1.54 [0.26–9.20]
   Middle-East 4 52.5 3.37 [0.70–16.22]
   America 3 0.0 4.50 [1.89–10.68]
  Specimen types PET 7 28.0 3.13 [1.09–9.03]
   FFT 3 0.0 3.70 [1.54–8.88]
  Year of publication −2010 4 12.4 1.59 [0.51–4.96]
   2011- 6 0.0 4.62 [2.17–9.81]
33    5 0.0 3.64 [1.26–10.48]
  Nationality of subjects Far-East 2 69.6 2.10 [0.06–68.51]
   Middle-East 3 0.0 3.70 [0.98–13.90]
  Specimen types PET 5 0.0 3.64 [1.26–10.48]
   FFT - - -
  Year of publication −2010 3 40.4 2.64 [0.44–15.76]
   2011- 2 0.0 4.88 [0.87–27.56]
  1. CIconfidence intervals, FFT fresh frozen tissue, PET paraffin-embedded tissue, REM random effect model