Table 3.

Performance of CER estimating equation Da by subgroups in the external validation data set

SubgroupNumber of ParticipantsPercent DifferenceP15 (95% CI)RMSE (95% CI)
Median (95% CI)IQR
Age (years)
    ≤505003.4 (1.9, 4.9)2555 (50, 59)365 (329, 397)
    51 to 65300−6.1 (−8.9, −3.3)3246 (40, 52)359 (320, 394)
    >65187−7.1 (−12.9, −1.3)3646 (38, 53)334 (253, 398)
Sex
    male583−2.9 (−5.1, −0.8)3450 (46, 55)396 (362, 427)
    female4042.7 (0.3, 5.0)2951 (46, 56)293 (260, 323)
Race
    black579.7 (4.3, 15.1)1444 (31, 57)392 (323, 451)
    white/other930−1.7 (−3.3, −0.04)3251 (48, 54)355 (329, 380)
BMI (kg/m2)
    ≤254321.5 (−1.5, 4.5)2853 (48, 57)306 (275, 334)
    26 to 29369−1.4 (−4.0, 1.2)3747 (42, 52)404 (354, 449)
    ≥30186−4.1 (−8.5, 0.3)3453 (46, 60)370 (326, 408)
GFR (ml/min per 1.73 m2)
    ≥901418.7 (5.6, 11.7)2255 (46, 63)384 (308, 447)
    60 to 892232.5 (0.03, 5.0)2657 (51, 64)334 (285, 377)
    30 to 59384−1.6 (−4.5, 1.3)3250 (45, 55)354 (306, 397)
    <30239−8.8 (−13.8, −3.9)3843 (36, 49)367 (328, 402)
  • a Equation D: eCER = 879.89 + 12.51 × weight (kg) − 6.19 × age + (34.51 if black) − (379.42 if female).