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Table 2 Comparison in body mass index (BMI) Z-scores between menstruating (post-) and non-menstruating (pre-) adolescent girls by the characteristics of adolescent girls

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

  BMI Z-scores, Mean ± SD P a
Pre- Post-
Education
  < 6 −1.10 ± 0.78 −0.57 ± 0.77 0.19
 6–9 −1.15 ± 1.01 −0.30 ± 0.81 <0.01
  > 9   −0.33 ± 0.88b  
Family size
  < 3   −0.05 ± 0.69b  
 3–5 −1.18 ± 1.05 −0.29 ± 0.81 <0.01
  > 5 −1.12 ± 0.91 −0.58 ± 0.84 0.03
Source of income
 Farming only −1.13 ± 0.83 −0.37 ± 0.79 <0.01
 Farming plus others −1.5 ± 0.78 −0.43 ± 0.86 <0.01
 Others −0.90 ± 1.26 −0.23 ± 0.82 0.01
Rural and urban
 Urban −1.08 ± 1.16 −0.19 ± 0.83 <0.01
 Rural −1.20 ± 0.97 −0.36 ± 0.81 <0.01
Geography site
 Northern plateau −1.22 ± 1.23 −0.40 ± 0.91 <0.01
 Central Shaanxi −1.15 ± 1.01 −0.30 ± 0.81 <0.01
 Southern region −1.21 ± 0.77 −0.27 ± 0.71 <0.01
  1. aTwo-sample t-test was used to examine differences between pre- and post- menstruating
  2. bNo subjects were observed in non-menstruating (pre-) category