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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