Table 2.

Cox model for risk of death by BMI category in children

ModelUnderweightObese
HRa (95% CI)P ValueHRa (95% CI)P Value
Unadjusted (n=13,172)1.27 (1.09 to 1.47)0.0021.23 (1.09 to 1.39)0.001
Adjusted model in primary analysis (n=13,172)1.26 (1.09 to 1.47)0.0031.17 (1.03 to 1.32)0.02
Model with additional adjustment for median income (n=12,764)1.35 (1.16 to 1.58)<0.0011.15 (1.01 to 1.31)0.04
Adjusted for transplant as a time-dependent covariate (n=13,172)1.20 (1.03 to 1.39)0.021.09 (0.96 to 1.24)0.16
  • All models were adjusted for sex, race, cause of ESRD, Medicaid status, and calendar year of ESRD onset and stratified by age categories to protect against nonproportionality.

  • a Normal BMI is the reference category, with underweight defined as <5th percentile and obese defined as ≥95th percentile using the CDC age– and sex–standardized BMI z scores