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Table 2 Selected characteristics of included and excluded boys

From: Associations between exposure to perfluoroalkyl substances and body fat evaluated by DXA and MRI in 109 adolescent boys

  na Included boys n Excluded boys P-valueb
Median (25th-75th percentiles) Median (25th-75th percentiles)
Age (years) 114 12.5 (11.4–13.1) 286 12.2 (11.4–13.1) 0.372
Tanner stage 105   250   
 1 23   86   
 2 34   74   
 3 30   52   
 4 16   27   
 5 2   11   0.008
Height (cm) 114 157.9 (150.4–166.7) 285 156.1 (148.6–163.9) 0.157
Height SDS 114 0.10 (-0.66–0.81) 285 0.01 (-0.88–0.70) 0.261
Weight (kg) 114 44.9 (38.4–50.9) 285 43.7 (37.4–50.0) 0.171
Weight SDS 114 -0.004 (-0.72–0.77) 285 -0.12 (-0.77–0.63) 0.266
BMI (kg/m2) 114 17.9 (16.6–19.8) 285 17.8 (16.5–19.5) 0.388
BMI SDS 114 -0.19 (-0.79–0.62) 285 -0.13 (-0.81–0.57) 0.579
  1. Boys who participated in the pubertal follow-up were included in the present study if they also had a pubertal MRI performed, those without an MRI were excluded
  2. Please note that five boys did not have a PFAS measurement and could thus not be included in the statistical analyses
  3. Differences between the two groups were tested using Chi-squared test for categorical data, Mann–Whitney U-test for non-parametric data and Student’s t-test for parametric data. Significant values (P < 0.05) are highlighted in bold