Anthropometry
BMI (measured in kg/m2) was evaluated from baseline (time of transplant) to up to five years post-transplant. Height and weight data were collected during clinic visits using a metric scale and wall mounted stadiometer. BMI from patients less than 20 years old were converted to percentiles using age appropriate scales. For patients younger than 2 years, the ”Child Growth Standards” SAS macro supplied by the World Health Organization (WHO) was used.19 For patients 2 – 20 years old, we used an SAS program from the Centers for Disease Control and Prevention.20 Percentiles were stratified to weight groups according to the following: obese (> 95%), overweight (85 – 94.9%), normal weight (5 – 84.9%), and underweight (< 5%). For patients older than 20 years old, we used the WHO criteria for adults21 to stratify BMI according to the following: obese (> 30 kg/m2), overweight (25 – 29.9 kg/m2), normal weight (18.5 – 24.9 kg/m2), and underweight (< 18.5 kg/m2).