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Table 1 Clinical characteristics of breast cancer tissues (cases) and breast benign diseases (controls)

From: Presence of human papillomavirus DNA in breast cancer: a Spanish case-control study

  Cases Controls
N Mean (CI 95%) N Mean (CI 95%)
Age** 251 56.32 (54.76–57.88) 186 40.08 (38.3–41.86)
Number of children 250 1.92 (1.76–2.09) 185 1.3 (1.11–1.5)
Breastfeeding duration (months) 191 8.65 (7.16–10.15) 115 9.42 (6.92–11.92)
Age at menopause 140 48.89 (48.16–49.61) 36 48 (46.47–49.53)
Tumor size (mm) 249 29.49 (26.99–31.99) 98 31.83 (29.31–34.34)
  1. CI 95% Confidence Interval 95%, ** Statistic Signification <0.01