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Table 1 Description of immigrants and controls

From: Risk of colorectal cancer among immigrants to Ontario, Canada

Females Immigrants Controls
Overall count
Overall count 209,843 1,049,215
Year of index date
 1991 - 1995 59,210 (28.2%) 290,050 (28.2%)
 1996 - 2000 53,063 (25.3%) 265,315 (25.3%)
 2001 - 2005 64,922 (30.9%) 324,610 (30.9%)
 2006 - 2008 32,648 (15.6%) 163,240 (15.6%)
Person years by year of index date
 1991 - 1995 940,939 person-years 5,292,802 person-years
 1996 - 2000 725,818 person-years 3,915,579 person-years
 2001 - 2005 646,525 person-years 3496,374 person-years
 2006 - 2008 225,685 person-years 1,213,181 person-years
Followup time by year of index date
 1991 - 1995
  Mean (SD) 15.89 years (7.59) 17.88 years (6.03)
  Median (IQR) 19.76 years (9.88 - 21.55) 20.28 years (16.26 - 21.78)
 1996 - 2000
  Mean (SD) 13.68 years (5.18) 14.76 years (4.12)
  Median (IQR) 15.40 years (13.08 - 17.27) 15.76 years (14.31 - 17.44)
 2001 - 2005
  Mean (SD) 9.96 years (3.48) 10.77 years (2.62)
  Median (IQR) 10.84 (9.24 - 12.43) 11.19 years (9.78 - 12.56)
 2006 - 2008
  Mean (SD) 6.91 years (2.09) 7.43 years (1.45)
  Median (IQR) 7.44 years (6.71 - 8.27) 7.64 years (7.02 - 8.35)
Age at index date
 40 - 49 years 97,829 (46.6%) 489,110 (46.6%)
 50 - 59 years 51,806 (24.7%) 259,489 (24.7%)
 60 - 69 years 41,029 (19.6%) 204,985 (19.5%)
 70 - 74 years 10,342 (4.9%) 51,447 (4.9%)
  > = 75 years 8837 (4.2%) 44,184 (4.2%)
Person years by age at index date
 40 - 49 years 1,235,292 person-years 6,646,937 person-years
 50 - 59 years 664,305 person-years 3,624,482 person-years
 60 - 69 years 470,317 person-years 2,700,938 person-years
 70 - 74 years 100,008 person-years 578,455 person-years
  > = 75 years 69,043.82 person-years 367,123.65 person-years
Followup time by age at index date
 40 - 49 years
  Mean (SD) 12.63 years (5.78) 13.59 years (5.25)
  Median (IQR) 12.34 years (8.44 - 17.27) 13.17 years (9.37 - 17.83)
 50 - 59 years
  Mean (SD) 12.82 years (6.24) 13.97 years (5.56)
  Median (IQR) 12.63 years (8.25 - 18.24) 13.56 years (9.39 - 18.82)
 60 - 69 years
  Mean (SD) 11.46 years (6.46) 13.18 years (5.70)
  Median (IQR) 11.42 years (6.87 - 16.66) 12.90 years (8.72 - 17.86)
 70 - 74 years
  Mean (SD) 9.67 years (6.16) 11.24 years (5.53)
  Median (IQR) 9.32 years (4.57 - 14.15) 10.98 years (7.30 - 15.17)
  > = 75 years
  Mean (SD) 7.81 years (5.28) 8.31 years (5.04)
  Median (IQR) 7.34 years (3.39 - 11.48) 7.89 years (4.30 - 11.70)
Males Immigrants Controls
Overall count 191,792 958,960
Year of index date
 1991 - 1995 48,793 (25.4%) 243,965 (25.4%)
 1996 - 2000 51,328 (26.8%) 256,640 (26.8%)
 2001 - 2005 62,371 (32.5%) 311,855 (32.5%)
 2006 - 2008 29,300 (15.3%) 146,500 (15.3%)
Person years by year of index date
 1991 - 1995 744,331 person-years 4,121,283 person-years
 1996 - 2000 685,887 person-years 3,702,915 person-years
 2001 - 2005 601,385 person-years 3,273,836 person-years
 2006 - 2008 196,843 person-years 1,062,171 person-years
Followup time by year of index date
 1991 - 1995
  Mean (SD) 15.25 years (7.73) 16.89 (6.58)
  Median (IQR) 19.45 years (8.28 - 21.30) 19.78 (13.12 - 21.56)
 1996 - 2000
  Mean (SD) 13.36 years (5.32) 14.43 (4.34)
  Median (IQR) 15.22 years (11.58 - 17.15) 15.56 (14.16 - 17.32)
 2001 - 2005
  Mean (SD) 9.64 years (3.69) 10.50 (2.88)
  Median (IQR) 10.62 years (9.03 - 12.36) 11.04 (9.50 - 12.50)
 2006 - 2008
  Mean (SD) 6.72 years (2.26) 7.25 (1.66)
  Median (IQR) 7.37 years (6.58 - 8.24) 7.56 (6.90 - 8.31)
Age at index date
 40 - 49 years 106,112 (55.3%) 530,757 (55.3%)
 50 - 59 years 40,062 (20.9%) 200,563 (20.9%)
 60 - 69 years 31,575 (16.5%) 157,362 (16.4%)
 70 - 74 years 8070 (4.2%) 40,492 (4.2%)
  > = 75 years 5973 (3.1%) 29,786 (3.1%)
Person years by age at index date
 40 - 49 years 1,289,734 person-years 7,047,301 person-years
 50 - 59 years 485,469 person-years 2,620,618 person-years
 60 - 69 years 344,004 person-years 1,886,805 person-years
 70 - 74 years 69,618 person-years 390,565 person-years
  > = 75 years 39,621 person-years 214,918 person-years
Followup time by age at index date
 40 - 49 years
  Mean (SD) 12.15 years (5.85) 13.28 years (5.23)
  Median (IQR) 12.12 years (8.09 - 16.70) 13.09 years (9.31 - 17.36)
 50 - 59 years
  Mean (SD) 12.12 years (6.11) 13.07 years (5.57)
  Median (IQR) 11.90 years (7.75 - 17.18) 12.61 years (8.69 - 17.70)
 60 - 69 years
  Mean (SD) 10.89 years (6.39) 11.99 years (5.77)
  Median (IQR) 10.81 years (6.36 - 15.76) 11.65 years (7.81 - 16.43)
 70 - 74 years
  Mean (SD) 8.63 years (5.80) 9.65 years (5.29)
  Median (IQR) 8.16 years (3.81 - 12.62) 9.11 years (6.09 - 13.08)
  > = 75 years   
  Mean (SD) 6.63 years (5.03) 7.22 years (4.66)
  Median (IQR) 6.18 years (2.18 - 9.90) 6.90 years (3.39 - 10.31)