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Table 4 distribution of tumor sites by family history of colorectal cancer according to age of the proband.

From: Family history of colorectal cancer in Iran

Age group Positive FH of CRC Negative FH of CRC
CRC localization   
Total N = 76 N = 373
Righta 28(36.9%) 66(17.7%)
Left 24(31.6%) 167(44.8%)
Rectum 22(29%) 139(37.3%)
NOS 2(2.5%) 1(0.03%)
Over 45 N = 43 N = 294
Rightb 14(32.6%) 49(16.7%)
Left 11(25.6%) 136(46.3%)
Rectum 18(41.8%) 109(37.1%)
Less than 45 N = 33 N = 79
Rightc 14(42.4%) 17(21.5%)
Left 13(39.4%) 31(39.2%)
Rectum 4(12.1%) 30(38%)
NOS 2(6.1%) 1(1.3%)
  1. †: difference of tumor site distribution between two groups (p < 0.001)
  2. a,b,c: p < 0.05
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