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Table 2 BMI z-score data prior to and 3 years following T&A at 3 age group categories

From: Improvement in BMI z-score following adenotonsillectomy in adolescents aged 12–18 years: a retrospective cohort study

Age Categories

Z-score BMI Before

Median Z score at 3 years

P-value

12–14 years

N = 132

N = 132

0.169

 Mean

.7590

.7820

 Median

.9000

.9425

 Std. Deviation

1.17618

1.23738

 Percentiles

  25

−0.0575

0.1425

  50

0.9000

0.9425

  75

1.7800

1.8563

14–16 years

N = 60

N = 60

0.306

 Mean

0.3988

0.5395

 Median

0.6750

0.6750

 Std. Deviation

1.39603

1.16127

 Percentiles

  25

−0.5525

−0.2813

  50

0.6750

0.6750

  75

1.3650

1.3200

16–18 years

N = 50

N = 50

0.173

 Mean

0.4016

0.3999

 Median

0.4400

0.4450

 Std. Deviation

1.52683

1.41840

 Percentiles

  25

−0.8150

−0.6263

  50

0.4400

0.4450

  75

1.8200

1.6350