Table 2.

Performance between measured glomerular filtration rate (GFR) and estimated GFR

Variable	Measured GFR (mL/min/1.73 m2)
	Overall	<30	30–59	≥60
Bias, median difference (mL/min/1.73 m2)
Asian formula	2.59	−1.48*	5.31†	10.79*
Korean formula	11.72*	7.17*	17.25*	14.85*
Japanese formula	−6.71*	−4.94*	−7.49*	−12.38*
Thai formula	3.74*	−0.98*	7.43*	14.47*
Chinese formula 1	2.22	−2.66*	5.58*	18.47*
Chinese formula 2	3.69	1.80	4.85	4.38
Precision, IQR of the difference (mL/min/1.73 m2)
Asian formula	21.40*	10.96*	23.28*	36.10*
Korean formula	22.06*	13.90*	25.52*	30.08*
Japanese formula	13.14*	9.77*	14.48*	25.61*
Thai formula	22.48*	11.25*	24.07*	37.71*
Chinese formula 1	23.06*	10.62†	24.98*	42.59*
Chinese formula 2	15.53	10.68	17.70	28.05
Accuracy, 30% accuracy (%)
Asian formula	49.2*	45.3*	53.0*	46.6*
Korean formula	37.8*	33.6*	37.2*	50.0†
Japanese formula	54.0†	42.3†	58.5‡	67.2‡
Thai formula	48.4*	46.0*	50.3*	48.3*
Chinese formula 1	47.4*	44.5*	50.3*	44.8†
Chinese formula 2	59.3	48.9	63.9	69.0
GFR category misclassification rate (%)
Asian formula	57.4*	43.8*	68.3*	55.2*
Korean formula	68.3*	57.7*	80.3†	55.2†
Japanese formula	58.5	48.2	65.0†	62.1†
Thai formula	59.5*	43.8*	72.1*	56.9*
Chinese formula 1	58.7*	41.6†	70.5*	62.1*
Chinese formula 2	54.0	43.8	63.4	48.3

Notes:

^*P<0.001 compared with Chinese formula 2-GFR;

^†P<0.01 compared with Chinese formula 2-GFR;

^‡P<0.05 compared with Chinese formula 2-GFR.

Abbreviations: GFR, glomerular filtration rate; IQR, interquartile range.