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Table 1 Characteristics of adolescent girls by selected variables

From: Correlation of body mass index levels with menarche in adolescent girls in Shaanxi, China: a cross sectional study

Variables Outcome
Age (years), Mean ± SD 15.0 ± 1.22
Education (years), Mean ± SD 8.3 ± 1.55
Age at menarche, Mean ± SD 13.3 ± 1.33
Family size(persons), Mean ± SD 4.3 ± 1.09
Body mass index (BMI) percentiles, n %
  ≤ 5th 286 53.7 %
 5th- ≤ 10th 53 9.9 %
 10th- ≤25th 42 7.9 %
 25th- ≤75th 104 19.5 %
 75th- ≤85th 28 5.3 %
 85th- 20 3.8 %
Rural and urban
 Urban 144 27 %
 Rural 389 73 %
Geography site
 Northern plateau 92 17 %
 Central Shaanxi 383 72 %
 Southern region 58 11 %
Source of income
 Farming only 153 28.7 %
 Farming plus others 122 23.9 %
 Others 258 48.4 %