| Factors | 
          | 
        Case:n=112 (%) | 
        Control: n=449 (%) | 
        COR(95% CI) | 
       
      
        | Gastritis  | 
        Yes  | 
        26(23.2)  | 
        40(8.9)  | 
        3.1(1.7, 5.3)*  | 
       
      
        | No  | 
        86(76.8)  | 
        409(91.1)  | 
        1  | 
       
      
        | Duodenal bleeding  | 
        Yes  | 
        5(4.5)  | 
        9(2.0)  | 
        2.3(1.8,6.9)*  | 
       
      
        | No  | 
        107(95.5)  | 
        440(97.9)  | 
        1  | 
       
      
        | Medication drugs  | 
        Yes  | 
        20(17.8)  | 
        39(8.7)  | 
        2.3(1.2,4.1)*  | 
       
      
        | No  | 
        92(82.1)  | 
        410(91.3)  | 
        1  | 
       
      
        | Diarrheas episode  | 
        Yes  | 
        5(4.5)  | 
        8(1.7)  | 
        2.5(0.8,8.0)  | 
       
      
        | No  | 
        107(95.5)  | 
        441(98.2)  | 
        1  | 
       
      
        | Intestinal parasite  | 
        Yes  | 
        35(31.3)  | 
        52(11.6)  | 
        3.4(2.1,5.7)*  | 
       
      
        | No  | 
        77(68.8)  | 
        397(88.4)  | 
        1  | 
       
      
        | Malaria    Infection | 
        Yes | 
        17(15.7) | 
        37(8.2) | 
        1.9(1.1,3.6)*  | 
       
      
        | No | 
        95(84.8) | 
        412(91.8) | 
        1 | 
       
      
        | Chronic    kidney disease | 
        Yes | 
        31(27.6) | 
        59(13.1) | 
        2.5(1.5,4.2)*  | 
       
      
        | No | 
        81(72.2) | 
        390(86.9) | 
        1 | 
       
      
        | Chronic    disease♠  | 
        Yes | 
        7(6.3) | 
        22(4.9) | 
        1.5(0.5,3.1) | 
       
      
        | No | 
        105(93.8) | 
        427(95.1) | 
        1 | 
       
      
        | Hemorrhoids | 
        Yes | 
        5(4.5) | 
        10(2.2) | 
        2.1(0.6,6.1) | 
       
      
        | No | 
        107(95) | 
        439(97.2) | 
        1 | 
       
      
        | Gum    bleeding | 
        Yes | 
        10(8.9) | 
        19(4.2) | 
        2.2(1.0,4.9)*  | 
       
      
        | No | 
        102(91.0) | 
        430(95.8) | 
        1 | 
       
      
        | Know    about anemia | 
        Yes | 
        28(25) | 
        142(31.6) | 
        0.7(0.4,1.1) | 
       
      
        | No | 
        84(75) | 
        307(68.4) | 
        1 | 
       
      
        | COR    (Crude Odds Ratio); ♠Chronic diseases includes:    Hypertension, Diabetics, Hepatitis, Skin disease, Asthmatic and Epileptic; *P<0.05.  | 
       
      |