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Table 1 Frequency and risk of H. pylori seropositivity among persons residing in rural Tanzania (May to June, 1985)

From: H. pylori-infection and antibody immune response in a rural Tanzanian population

Characteristic No. H. pylori positive/Total No. (%) OR 95% CI P value
Sex *     0.87
   Female 402/436 (92%) Ref.   
   Male 322/351 (92%) 1.04 0.67–1.62  
Age group, years*     <0.001
   0–4 138/181 (76%) Ref.   
   5–9 168/180 (93%) 4.4 2.42–7.81  
   10–17 148/152 (97%) 11.5 4.22–31.4  
   ≥18 264/268 (99%) 20.6 7.57–56.2  
Birth order†     <0.001
   1 79/105 (75%) Ref.   
   2 82/101 (91%) 3.3 1.7–6.8  
   ≥3 136/139 (97%) 11.1 3.7–34  
Next-older sibling ±     0.08
   Seronegative 23/29 (79%) Ref.   
   Seropositive 189/208 (91) 2.70 0.90–8.34  
Location of village     0.25
   Hill 272/290 (94%) Ref.   
   Valley 453/498 (91%) 0.66 0.33–1.33  
  1. Abbreviations: OR odds ratio; CI Confidence Interval
  2. * Sex is missing for one person and age is missing for 7 persons
  3. † Only children with information on birth-order included in this analysis
  4. ± "Next-older sibling" refers to the next-older sibling of the case child