Table 1.

Mean (SD) daily intake of heme iron (mg/d) according to categories of nondietary and dietary characteristics of participants of the NLCS

Men
Women
Subcohort
Colorectal cancer cases
Subcohort
Colorectal cancer cases
n (%)Heme iron (mg/d)n (%)Heme iron (mg/d)n (%)Heme iron (mg/d)n (%)Heme iron (mg/d)
All2,156 (100)1.16 (0.51)869 (100)1.17 (0.53)2,215 (100)0.98 (0.48)666 (100)0.97 (0.43)
Age (y)
    55-59834 (39)1.19 (0.51)244 (28)1.25 (0.62)869 (39)0.98 (0.46)165 (25)0.99 (0.44)
    60-64746 (35)1.16 (0.51)325 (37)1.14 (0.46)738 (33)0.95 (0.45)254 (38)0.94 (0.40)
    65-69576 (27)1.13 (0.52)300 (35)1.14 (0.53)608 (27)0.99 (0.55)247 (37)0.97 (0.44)
BMI (kg/m2)
    <23425 (20)1.06 (0.50)149 (17)1.07 (0.54)597 (27)0.90 (0.48)154 (23)0.88 (0.44)
    23-24.9689 (32)1.16 (0.51)262 (30)1.20 (0.55)600 (27)0.95 (0.48)174 (26)0.96 (0.37)
    25-26.9565 (26)1.18 (0.49)231 (27)1.13 (0.51)418 (19)0.99 (0.45)138 (21)0.98 (0.45)
    ≥27404 (19)1.23 (0.56)195 (22)1.28 (0.52)525 (24)1.06 (0.49)173 (26)1.04 (0.44)
Family history of colorectal cancer
    No2,044 (95)1.16 (0.52)783 (90)1.18 (0.54)2,092 (94)0.98 (0.49)609 (91)0.96 (0.42)
    Yes112 (5)1.11 (0.41)86 (10)1.16 (0.51)123 (6)0.97 (0.45)57 (9)1.00 (0.47)
Cigarette smoking status
    Never272 (13)1.12 (0.53)90 (10)1.15 (0.51)1,287 (58)0.98 (0.49)406 (61)0.96 (0.41)
    Former1,105 (51)1.14 (0.49)521 (60)1.15 (0.52)459 (21)0.96 (0.46)139 (21)0.97 (0.42)
    Current779 (36)1.21 (0.53)258 (30)1.23 (0.58)469 (21)0.98 (0.49)121 (18)0.99 (0.49)
Nonoccupational physical activity (min/d)
    <30392 (18)1.15 (0.55)136 (16)1.20 (0.56)547 (25)0.97 (0.51)199 (30)0.98 (0.46)
    30-60661 (31)1.15 (0.50)268 (31)1.14 (0.53)679 (31)0.96 (0.45)193 (29)0.97 (0.40)
    60-90401 (19)1.15 (0.48)177 (20)1.19 (0.53)491 (22)0.97 (0.46)149 (22)0.93 (0.41)
    >90678 (31)1.18 (0.52)277 (32)1.20 (0.53)468 (21)1.03 (0.52)117 (18)1.00 (0.44)
Total energy intake, MJ/d (median)
    Q1 (m/w, 6.5/5.1)*430 (20)0.94 (0.45)183 (21)0.98 (0.46)442 (20)0.82 (0.42)141 (21)0.85 (0.45)
    Q2 (m/w, 7.9/6.1)431 (20)1.07 (0.48)175 (20)1.10 (0.50)444 (20)0.92 (0.48)141 (21)0.90 (0.42)
    Q3 (m/w, 8.9/6.9)431 (20)1.16 (0.48)200 (23)1.15 (0.47)443 (20)0.96 (0.42)138 (21)0.96 (0.37)
    Q4 (m/w, 10/7.8)432 (20)1.21 (0.47)159 (18)1.24 (0.53)445 (20)1.00 (0.51)131 (20)1.06 (0.39)
    Q5 (m/w, 12/9.2)432 (20)1.42 (0.55)152 (17)1.45 (0.63)441 (20)1.17 (0.51)115 (17)1.09 (0.46)
Alcohol intake (g/d)
    0303 (14)1.06 (0.50)111 (13)1.04 (0.62)681 (31)0.95 (0.54)229 (34)0.94 (0.44)
    0.1-4.9447 (21)1.13 (0.52)199 (23)1.15 (0.54)765 (34)0.96 (0.48)206 (31)0.93 (0.43)
    5-14.9585 (27)1.13 (0.50)190 (22)1.17 (0.50)394 (18)1.00 (0.40)120 (18)1.00 (0.41)
    15-29.9480 (22)1.22 (0.49)202 (23)1.19 (0.46)201 (9)1.04 (0.45)57 (9)1.11 (0.40)
    ≥30313 (15)1.27 (0.53)162 (19)1.30 (0.58)73 (3)1.07 (0.48)29 (4)1.09 (0.31)
Total vegetable consumption, g/d (median)
    Q1 (m/w, 102/106)432 (20)1.05 (0.47)183 (21)1.08 (0.49)446 (20)0.86 (0.38)147 (22)0.93 (0.40)
    Q2 (m/w, 144/149)431 (20)1.11 (0.44)160 (18)1.12 (0.50)443 (20)0.96 (0.44)129 (19)0.92 (0.44)
    Q3 (m/w, 177/183)435 (20)1.17 (0.51)181 (21)1.15 (0.48)449 (20)0.96 (0.44)129 (19)0.95 (0.41)
    Q4 (m/w, 218/224)432 (20)1.21 (0.53)174 (20)1.20 (0.51)439 (20)1.03 (0.50)135 (20)1.04 (0.42)
    Q5 (m/w, 295/300)426 (20)1.26 (0.58)171 (20)1.34 (0.64)438 (20)1.07 (0.61)126 (19)0.99 (0.46)
Total fresh meat intake, g/d (median)
    Q1 (m/w, 56/45)425 (20)0.75 (0.38)188 (22)0.76 (0.38)443 (20)0.55 (0.30)114 (17)0.50 (0.28)
    Q2 (m/w, 86/74)429 (20)0.98 (0.31)173 (20)1.04 (0.38)441 (20)0.83 (0.30)129 (19)0.86 (0.28)
    Q3 (m/w, 103/91)441 (20)1.12 (0.38)181 (21)1.21 (0.48)438 (20)1.00 (0.37)157 (24)1.01 (0.35)
    Q4 (m/w, 124/108)428 (20)1.29 (0.41)172 (20)1.27 (0.43)448 (20)1.10 (0.37)137 (21)1.10 (0.36)
    Q5 (m/w, 158/146)433 (20)1.66 (0.54)155 (18)1.68 (0.56)445 (20)1.39 (0.58)129 (19)1.28 (0.43)
Total processed meat intake, g/d (median)
    0 (0)201 (9)0.81 (0.46)78 (9)0.85 (0.51)296 (13)0.67 (0.43)87 (13)0.67 (0.37)
    0.1-9.9 (5)684 (32)0.98 (0.41)277 (32)1.00 (0.43)987 (45)0.86 (0.40)295 (44)0.88 (0.40)
    10-19.9 (14)610 (28)1.14 (0.43)239 (28)1.15 (0.44)539 (24)1.06 (0.43)169 (25)1.03 (0.35)
    ≥20 (32)661 (31)1.47 (0.53)275 (32)1.46 (0.58)393 (18)1.38 (0.51)115 (17)1.31 (0.38)
Total iron intake, mg/d (median)
    Q1 (m/w, 9.5/8.5)430 (20)0.85 (0.33)178 (20)0.88 (0.34)443 (20)0.70 (0.31)144 (22)0.71 (0.31)
    Q2 (m/w, 11/10)433 (20)1.01 (0.38)158 (18)1.00 (0.33)442 (20)0.85 (0.34)145 (22)0.89 (0.37)
    Q3 (m/w, 13/11)429 (20)1.15 (0.43)191 (22)1.12 (0.40)441 (20)0.94 (0.37)127 (19)0.95 (0.32)
    Q4 (m/w, 15/13)435 (20)1.28 (0.51)159 (18)1.28 (0.52)446 (20)1.01 (0.41)137 (21)1.10 (0.43)
    Q5 (m/w, 17/15)429 (20)1.52 (0.59)183 (21)1.58 (0.68)443 (20)1.38 (0.64)113 (17)1.24 (0.50)
  • * Median values for men/women (m/w).

  • Based on raw weight.