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Table 2 Incidence of anal fissure (cases/1000 person-years) stratified by age group and sex

From: The epidemiology and treatment of anal fissures in a population-based cohort

Age group Pooled incidence P Male incidence Female incidence P††
6-11 0.49 *** 0.44 0.54  
12-17 0.52 *** 0.24 0.80 ***
18-24 1.47   0.96 1.78 ***
25-34 1.76   1.76 1.76  
35-44 1.46   1.62 1.34  
45-54 1.25 ** 1.29 1.22  
55-64 1.31 * 1.51 1.13 ***
65+ 1.01 *** 1.17 0.88  
Total 1.10   1.04 1.14  
  1. Difference between 25–34 group and starred age groups significant at: *P < 0.01; **P < 0.001; ***P < 0.0001.
  2. ††Difference between sexes within this age group significant at: ***P < 0.0001.