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Table 1 Demographic characteristics of the participants in the Perth Infant Feeding Study II

From: Breastfeeding duration in mothers who express breast milk: a cohort study

  Total sample (n = 587) % of total sample % who expressed at 4 weeks
Maternal age (years)    
<20 32 5.5 62
20–29 292 20.8 57
30+ 262 30.4 47
Maternal education    
Did not complete high school 211 35.9 51
Completed high school or equivalent* 307 52.3 52
Bachelor degree or higher 69 11.8 55
Parity    
Primiparous 216 36.8 68
Multiparous 371 63.2 44
Birthweight (g)    
<2500 13 2.2 82
>2500 566 97.8 52
  1. * Includes those with a trade or technical certificate/diploma.