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Table 1 Characteristics of the study cohort

From: The relative risk of second primary cancers in Queensland, Australia: a retrospective cohort study

  First Primary Cancers Second Primary Cancers
  Number of cases % Number of cases %
Total 204,962 100.0 23,580 100.0
Sex     
   Males 110,961 54.1 14,388 61.0
   Females 94,001 45.9 9,192 39.0
Age at first diagnosis     
   15-49 years 41,690 20.3 3,150 13.4
   50-64 years 60,573 29.6 7,687 32.6
   65 years and over 102,699 50.1 12,743 54.0
Period of first diagnosis     
   1982-1986 36,216 17.7 4,716 20.0
   1987-1991 43,904 21.4 5,841 24.8
   1992-1996 57,381 28.0 6,972 29.6
   1997-2001 67,461 32.9 6,051 25.7
Follow-up interval     
   2 months to less than 1 year n.a. 2,511 10.6
   1 year to less than 5 years n.a. 8,924 37.8
   5 years to less than 10 years n.a. 7,286 30.9
   10 years or longer n.a. 4,859 20.6
Type of first primary cancer     
   Head and neck (C00-C14,C30-C32) 10,942 5.3 1,989 8.4
   Oesophagus (C15) 2,075 1.0 105 0.4
   Stomach (C16) 4,103 2.0 206 0.9
   Colorectal (C18-C20,C218) 27,814 13.6 3,046 12.9
   Pancreas (C25) 2,817 1.4 49 0.2
   Lung (C33-C34) 17,347 8.5 729 3.1
   Melanoma (C44,M872-M879) 29,289 14.3 5,092 21.6
   Breast - female (C50) 26,725 13.0 2,962 12.6
   Cervix (C53) 3,492 1.7 300 1.3
   Uterus (C54) 3,527 1.7 409 1.7
   Ovary (C56) 2,864 1.4 164 0.7
   Prostate (C61) 23,122 11.3 3,006 12.7
   Kidney (C64-C66,C68) 4,927 2.4 655 2.8
   Bladder (C67) 8,719 4.3 1,680 7.1
   Brain & CNS (C70-C72) 2,566 1.3 50 0.2
   Thyroid (C73) 2,302 1.1 215 0.9
   Non-Hodgkin lymphoma (M967-M972) 6,618 3.2 689 2.9
   Lymphoid leukaemia (M982-M983) 2,645 1.3 422 1.8
   Myeloid leukaemia (M984-M993) 2,195 1.1 125 0.5
   Myeloma/PCT (M973) 2,174 1.1 134 0.6
   Other 18,699 9.1 1,553 6.6
  1. n.a. = not applicable; CNS = central nervous system; PCT = plasma cell tumours.