Table 1.

Within-population and within-individual mean, SD and coefficient of variation (CV) for creatinine and reciprocal of creatinine concentration, urine specific gravity (USG) and glomerular filtration rate (GFR) in azotaemic and non-azotaemic cats

		Mean within-population (baseline)	SD within-population (baseline)	CV% within-population (baseline)	Mean within-individual	Mean SD within-individual	Mean CV% within-individual
Creatinine (µmol/l)	All cats	153.96	55.33	35.94	150.79	12.29	8.47
	Azotaemic cats	247.80	58.10	23.45	244.22	15.81	6.81
	Non-azotaemic cats	134.40	28.75	21.39	131.32	11.55	8.82
Reciprocal creatinine (l/µmol)	All cats	0.007	0.002	28.57	0.007	0.001	8.47
	Azotaemic cats	0.004	0.001	25.00	0.004	<0.001	6.81
	Non-azotaemic cats	0.008	0.002	25.00	0.008	0.001	8.82
USG	All cats	0.046	0.020	43.48	0.042	0.011	23.85
	Azotaemic cats	0.028	0.019	67.86	0.025	0.004	13.19
	Non-azotaemic cats	0.050	0.019	38.00	0.047	0.012	26.66
GFR (ml/min/kg)	All cats	1.63	0.63	38.65	7.91	1.64	21.53
	Azotaemic cats	0.84	0.37	44.05	4.39	1.35	28.94
	Non-azotaemic cats	1.80	0.54	30.00	8.64	1.70	19.98
GFR (ml/min)	All cats	6.80	2.73	40.15	7.13	1.28	19.01
	Azotaemic cats	3.51	0.79	22.51	4.22	1.20	27.03
	Non-azotaemic cats	7.49	2.48	33.11	7.74	1.31	17.33