Table 4.

Correlation between SUN and creatinine, and SUN and EGFR

	All SUN tests	SUN at enrolment	SUN at day 7	SUN at 1 months
No of pairs	1464	649	379	244
Spearman r (95% CI) SUN-creatinine	0.40 (0.35 to 0.44)	0.48 (0.42 to 0.54)	0.22 (0.12 to 0.32)	0.20 (0.07 to 0.32)
P value	<0.0001	<0.0001	<0.0001	0.0022
Spearman r (95% CI) SUN-eGFR	−0.39 (−0.43 to −0.34)	−0.47 (−0.53 to −0.41)	−0.22 (−0.31 to −0.12)	−0.21 (−0.33 to −0.08)
P value	<0.0001	<0.0001	<0.0001	0.0008

eGFR, estimated glomerular filtration rate; SUN, saliva urea nitrogen.