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Table 1 Characteristics of subjects (n = 2066)

From: The relationship between breastfeeding and weight status in a national sample of Australian children and adolescents

Characteristics N %
Gender of study child   
   Male 1010 48.9
   Female 1056 51.1
Age group of study child   
   9-13 years 1046 50.6
   14-16 years 1020 49.4
Maternal age (years ± SD) 42.7 ± 5.6
Maternal age at birth of study child (years ± SD) 29.8 ± 5.3
Maternal highest primary/secondary education   
   < Year 10 98 4.7
   Year 10 and 11 782 37.9
   Year 12 or equivalent 1186 57.4
Maternal birth country   
   Australia/New Zealand 1645 79.6
   United Kingdom/Ireland 178 8.6
   Asia and Indian sub-continent 87 4.2
   All other countries 156 7.6
Study child ever been breastfed 1908 92.4
Breastfeeding duration   
   0 months 173 8.4
   < 2 months 263 12.7
   2-< 4 months 204 9.9
   4-< 6 months 307 14.9
   ≥ 6 months 1119 54.2
Weight statusa of study child   
   Underweight 108 5.3
   Healthy weight 1438 69.6
   Overweight 387 18.7
   Obese 133 6.4
Averageb duration of moderate-to-vigorous physical activity
   < 60 minutes/day 452 21.9
   ≥ 60 minutes/day 1614 78.1
Averageb screen-time duration of study child   
   < 2 hours/day 350 16.9
   ≥ 2 hours/day 1716 83.1
Averageb sleep duration of study child   
   < 8 hours/day 90 4.4
   8-10 hours/day 1045 50.6
   > 10 hours/day 931 45.0
Averagec daily energy intake (mean MJ/d ± SD)   
   9-13 yrs, males (n = 493) 9.39 ± 2.38
   9-13 yrs, females (n = 556) 8.09 ± 2.13
   14-16 yrs, males (n = 521) 11.09 ± 3.27
   14-16 yrs, females (n = 503) 8.20 ± 2.32
  1. a Age and gender specific BMI equivalent to an adult BMI: underweight (< 18.5 kg/m2); normal weight (18.5-24.9 kg/m2); overweight (25-29.9 kg/m2); obese (≥ 30 kg/m2)
  2. b Average of four days of recording
  3. c Average of two 24 h recalls