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. Author manuscript; available in PMC: 2014 Jul 30.
Published in final edited form as: N Engl J Med. 2014 Jan 30;370(5):403–411. doi: 10.1056/NEJMoa1309753

Table 3.

Probability of Obesity in Eighth Grade, Spring Semester (Mean Age, 14.1 Years), According to z Score and Percentile of Body-Mass Index at Earlier Ages.*

Weight Category
and z Score		 Percentile of
Body-Mass
Index		 Probability of Obesity in Eighth Grade, Spring Semester
Kindergarten,
Fall Semester:
Mean Age,
5.6 Yr		 Kindergarten,
Spring Semester:
Mean Age,
6.1 Yr		 First Grade,
Fall Semester:
Mean Age,
6.6 Yr		 First Grade,
Spring Semester:
Mean Age
7.1 Yr		 Third Grade,
Spring Semester:
Mean Age,
9.1 Yr		 Fifth Grade,
Spring Semester:
Mean Age,
11.1 Yr
percent
Normal weight
  0.00 50 6 6 5 5 2 <1
  0.25 60 9 9 8 8 3 1
  0.52 70 13 13 12 12 5 1
  0.84 80 19 20 19 19 11 4
Overweight
  1.04 85 25 25 25 24 16 7
  1.28 90 33 34 33 33 25 16
Obese
  1.64 95 47 49 48 48 44 39
  2.33 99 72 75 75 76 80 87
*

Data are from the Early Childhood Longitudinal Study, Kindergarten Class of 1998–1999.8