. 2021 Jul 22;19:eAO5925. doi: 10.31744/einstein_journal/2021AO5925

Table 2. Summarized measures of fibroblast growth factor 23 levels according to estimated glomerular filtration rate and 25 OH vitamin D.

	eGFR <45mL/minute/1.73m²		eGFR ≥45mL/minute/1.73m²		p value
	25(OH)D <20ng/mL	25(OH)D ≥20ng/mL	25(OH)D <20ng/mL	25(OH)D ≥20ng/mL	p value
FGF23 (RU/mL)					<0.001
Mean±SD	138.6±93.1	109.2±84.0	75.6±42.8^a	68.5±41.7^b
95%CI	104.4-172.7	66.00-152.4	63.9-87.3	55.5-81.5
n (%)	31 (21.5)	17 (11.8)	54 (37.5)	42 (29.2)

p value: descriptive level of Kruskal-Wallis test. Kolmogorov-Smirnov test (p<0.001). Different letters have different means from multiple comparisons. eGFR: estimated glomerular filtration rate; 25(OH)D: 25(OH) vitamin D; FGF23: fibroblast growth factor 23; SD: standard deviation; 95%IC: 95% confidence interval.