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Table 3 Mean and median age at menarche, northwest Ethiopia.

From: Age at menarche and the menstrual pattern of secondary school adolescents in northwest Ethiopia

Variable Probit analysis Recall age
  n median (95% CI) n mean ± sd t P- value
District       
   Dabat 286 15.3(14.5-15.8) 294 15.9 ± 1 2.2 >0.06
   Koladiba 279 14.4(12.2-15.2) 284 15.7 ± 1   
Residence       
   Rural 343 15.1(10.3-16) 349 15.9 ± 1 3.26 <0.001
   Urban 222 14.4(11.9-15.2) 229 15.6 ± 1   
Total 565 14.8(13.9-15.3)* 578 15.8 ± 1   
  1. *X2 = 3.92, df = 4, p = 0.415