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Table 3 Multivariate ordinal logistic regression analysis of risk factors associated with polyp size in males and females

From: Determinants of polyp Size in patients undergoing screening colonoscopy

   Males (n = 48,395) Females (n = 34,246)
   OR (95% CI) OR (95% CI)
Age      
  < 50 1.00   1.00  
  50 - 59 1.06 (0.98 - 1.16) 1.00 (0.91 - 1.11)
  60 - 69 1.29 (1.18 - 1.40)** 1.14 (1.03 - 1.26)*
  70 - 79 1.36 (1.24 - 1.49)** 1.34 (1.20 - 1.49)**
  80+ 1.55 (1.35 - 1.79)** 1.46 (1.25 - 1.70)**
Site      
  Academic 1.00   1.00  
  Community/HMO 1.26 (1.18 - 1.34)** 1.22 (1.13 - 1.33)**
  VA/Military 0.97 (0.90 - 1.05) 0.90 (0.78 - 1.03)
Race      
  White 1.00   1.00  
  Black 1.31 (1.21 - 1.42)** 1.36 (1.24 - 1.48)**
Location     
  Distal Colon and rectum 1.00   1.00  
  Proximal Colon 1.11 (1.08-1.15)** 1.33 (1.27-1.39)**
Number of polyps     
  Single 1.00   1.00  
  Multiple 3.41 (3.29 - 3.54)** 3.04 (2.90 - 3.18)**
Family history     
  Negative 1.00   1.00  
  Positive 1.00 (0.95 - 1.05) 1.03 (0.98 - 1.08)
  1. All odds ratios are adjusted for all other covariates in the table. * P < .01 **P < .0001
  2. Odds Ratios (OR) and 95% Confidence Intervals (CI) obtained from ordinal logistic regression. Polyp size was stratified into 4 categories: 0-5, > 5-9, > 9-15, and > 15-40 mm. The odds ratio is the risk associated with an increase of polyp size corresponding to moving from one category to the next larger category, i.e. ≤ 5 mm vs. > 5 mm; ≤ 9 vs. > 9; ≤ 15 vs. > 15 mm.