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Table 1 Demographics of FAP and AFAP study participants

From: Variables affecting penetrance of gastric and duodenal phenotype in familial adenomatous polyposis patients

Characteristics Total (n = 150) FAP (n = 79) AFAP (n = 71) p-value1
Male (%) 42% (n = 62) 41% (n = 32) 42% (n = 30) 0.8282
Age in years
 Mean 41.4 39.6 43.4 0.0533
 Median 40 38.0 44
Range 18–68 18–67 18–68
Genetic diagnosis 93.3% 87.3% 100%  
Colectomy 73.3% (n = 110) 98.7% (n = 78) 45.0% (n = 32) < 0.0001
Average age at colectomy (range) 28.1 (8–60) 23.4 (8–46) 39.4 (22–60) < 0.0001
NSAID usage in last 3 months 11.3% (n = 17) 13.9% (n = 11) 8.5% (n = 6) 0.2910
Current smokers 14.7% (n = 22) 15.2% (n = 12) 14.1% (n = 10) 0.8490
Number unique families 68.0% (n = 102) 75.9% (n = 60) 59.2% (n = 42)  
  1. 1Categorical values compared with chi-square test (gender, genetic diagnosis, colectomy, NSAID use, current smokers). Continuous variables compared with Wilcoxon rank sum test (age, average age at colectomy)