Table 2.

Comparison of BMI-age-z with BMI-height-age-z as predictors of adiposity and relative lean mass in CKD

CKD StageMeasured Minus Predicted LM-Height-ZMeasured Minus Predicted FM-Height-Z
MalesFemalesMalesFemales
Predicted from BMI-age-zPredicted from BMI-height-age-zPredicted from BMI-age-zPredicted from BMI-height-age-zPredicted from BMI-age-zPredicted from BMI-height-age-zPredicted from BMI-age-zPredicted from BMI-height-age-z
CKD stage 2–30.43 (0.13–0.74)0.41 (0.13–0.70)0.38 (0.01–0.75)0.25 (−0.11 to 0.60)−0.14 (−0.40 to 0.13)−0.16 (−0.43 to 0.12)0.16 (−0.14 to 0.46)0.01 (−0.27 to 0.30)
CKD stage 4–5–dialysis0.41 (0.17–0.65)0.20 (−0.03 to 0.42)0.27 (−0.01 to 0.55)−0.15 (−0.43 to 0.13)0.26 (0.05–0.46)0.03 (−0.18 to 0.24)0.50 (0.24–0.76)0.05 (−0.16 to 0.27)
  • Each of LM-height-z and FM-height-z were predicted first from BMI-age-z, age, race, and study site. The predicted LM-height-z and FM-height-z were each subtracted from the corresponding measured values; the mean differences with 95% confidence intervals are presented. Then, BMI-height-age-z was substituted for BMI-age-z in the predictive equations to predict each of LM-height-z and FM-height-z. The BMI-height-age-z predicted LM-height-z and FM-height-z were each subtracted from the corresponding measured values; the mean differences with 95% confidence intervals are presented. Confidence intervals that do not include zero indicate statistically significant differences. LM, lean mass; FM, fat mass; BMI, body mass index.