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Table 1 General characteristics of the study subjects, N (%)

From: Dietary calcium intake and the risk of colorectal cancer: a case control study

  Men (n = 2496) Women (n = 1192)
Case Control P-valuea Case Control P-value
(n = 624) (n = 1872) (n = 298) (n = 894)
Age group (years)       
 −49 128(20.5) 461(24.6) <0.001 82(27.5) 246(27.5) >0.999
 50–59 226(36.2) 815(43.5)   111(37.3) 333(37.3)  
 60+ 270(43.3) 596(31.8)   105(35.2) 315(35.2)  
Marital status       
 Married 556(89.1) 1671(89.3) 0.262 216(72.5) 697(78.0) 0.028
 Single 66(10.6) 167(8.9)   80(26.9) 184(20.6)  
 Missing 2(0.3) 34(1.8)   2(0.7) 13(1.5)  
Education level       
 Less than middle school 183(29.3) 250(13.4) <0.001 138(46.3) 146(16.3) <0.001
 High school 265(42.5) 498(26.6)   103(34.6) 365(40.8)  
 College or more 176(28.2) 1024(54.7)   57(19.1) 332(37.1)  
 Missing 0(0.0) 100(5.3)   0(0.0) 51(5.7)  
Household income (10000 won/month)       
 <200 222(35.6) 348(18.6) <0.001 99(33.2) 212(23.7) 0.016
 200–400 252(40.4) 727(38.8)   134(45.0) 313(35.0)  
 >400 150(24.0) 588(31.4)   65(21.8) 230(25.7)  
 Missing 0(0.0) 209(11.2)   0(0.0) 139(15.6)  
Body mass index (kg/m2)       
 <25 431(69.1) 1136(60.7) <0.001 207(69.5) 661(73.9) 0.133
 ≥25 192(30.8) 736(39.3)   91(30.5) 233(26.1)  
 Missing 1(0.2) 0(0.0)   0(0.0) 0(0.0)  
Smoking status       
 Non-smoker 145(23.2) 391(20.9) 0.418 264(88.6) 854(95.5) <0.001
 Ex-smoker 302(48.4) 951(50.8)   15(5.0) 21(2.4)  
 Current smoker 177(28.4) 530(28.3)   19(6.4) 18(2.0)  
 Missing 0(0.0) 0(0.0)   0(0.0) 1(0.1)  
Alcohol consumption       
 Non-drinker 107(17.2) 308(16.5) <0.001 172(57.7) 567(63.4) 0.031
 Ex-drinker 103(16.5) 201(10.7)   26(8.7) 44(4.9)  
 Current drinker 414(66.4) 1360(72.7)   100(33.5) 282(31.5)  
 Missing 0(0.0) 3(0.2)   0(0.0) 1(0.1)  
Regular exercise       
 No 388(62.2) 786(42.0) <0.001 225(75.5) 403(45.1) <0.001
 Yes 236(37.8) 1073(57.3)   73(24.5) 488(54.6)  
 Missing 0(0.0) 13(0.7)   0(0.0) 3(0.3)  
Family history of cancer       
 No 391(62.7) 1016(54.3) <0.001 171(57.4) 446(49.9) 0.038
 Yes 233(37.3) 846(45.2)   127(42.6) 438(49.0)  
 Missing 0(0.0) 10(0.5)   0(0.0) 10(1.1)  
Family history of colorectal cancer       
 No 559(89.6) 1768(94.4) <0.001 277(93.0) 816(91.3) 0.715
 Yes 65(10.4) 94(5.0)   21(7.1) 68(7.6)  
 Missing 0(0.0) 10(0.5)   0(0.0) 10(1.1)  
Calcium supplement use within 2 years       
 No 621(99.5) 1807(96.5) <0.001 290(97.3) 729(81.5) <0.001
 Yes 3(0.5) 65(3.5)   8(2.7) 165(18.5)  
Total energy intake (kcal/day), Mean (SD) 2210.4(514.4) 1811.4(553.4) <0.001 1885.9(534.3) 1674.3(604.4) <0.001
Total calcium intake (mg/day), Mean (SD) 463.7(211.2) 450.8(248.6) 0.207 474.7(248.0) 536.8(335.1) <0.001
  1. ap-values were calculated by the chi-square test or t-test