Table 2.
Concordance of obesity defined by waist circumference (WC) z-scores and body mass index (BMI) z-scores, stratified by underlying chronic kidney disease (CKD) diagnosis at baseline. For BMI, obesity was defined as ≥ 95th percentile for all children. For WC, obesity was defined as ≥ 94th percentile for boys and ≥ 84th percentile for girls13.
| Non-glomerular CKD | Glomerular CKD | ||||
|---|---|---|---|---|---|
| BMI Without obesity | BMI With obesity | BMI Without obesity | BMI With obesity | ||
| Baseline | WC Without obesity | 415 (80.9%) | 19 (3.7%) | 148 (66.1%) | 8 (3.6%) |
| WC With obesity | 23 (4.5%) | 56 (10.9%) | 21 (9.4%) | 47 (21.0%) | |
| Kappa (95%CI) |
0.68 (0.59, 0.77) |
0.68 (0.57, 0.78) |
|||
| All Visits | WC Without obesity | 1805 (81.5%) | 88 (4.0%) | 558 (69.8%) | 31 (3.9%) |
| WC With obesity | 94 (4.2%) | 229 (10.3%) | 53 (6.6%) | 157 (19.6%) | |
| Kappa (95%CI) |
0.67 (0.62, 0.71) |
0.72 (0.66, 0.78) |
|||
Abbreviations: BMI, body mass index; CKD, chronic kidney disease; WC, waist circumference