Table 2.

Clinical data relating to population of cats in which the eGFR was developed and the population of cats in which the eGFR formula was tested. Continuous variables are presented as mean ± SD. FN ‐ female neutered, MN ‐ male neutered, DSH/DLH ‐ domestic short hair/domestic longhair

	eGFR formula development population (n = 55)	eGFR formula testing population (n = 25)	P value
Age (yrs)	12.8 ± 3.2	12.4 ±3.7	.626
Sex	FN n = 27 MN n = 28	FN n = 13 MN n = 12	.830
Breed	DSH/DLH n = 40 Pedigree n = 15	DSH/DLH n = 17 Pedigree n = 8	.885
GFR (mL/min/kg)	1.54 ± 0.57	1.87 ± 0.56	.016
Serum creatinine concentration (μmol/L)	154.15 ± 50.55	155.89 ± 52.86	.941
Reciprocal of serum creatinine concentration (μmol/L)	0.007 ± 0.002	0.007 ± 0.002	.925
Serum urea concentration (mmol/L)	12.02 ± 3.80	12.28 ± 4.00	.895
USG	1.046 ± 0.022	1.039 ± 0.021	.200
Body weight (kg)	4.42 ± 1.14	4.20 ± 1.31	.463
Body condition score (1‐9)	6 ± 1	5 ± 1	.228
Fat‐free mass (kg)	3.07 ± 0.62	Not measured	n/a
Predicted fat‐free mass (kg)	3.05 ± 0.59	3.02 ± 0.71	.909
Predicted muscle mass (kg)	2.02 ± 0.51	1.99 ± 0.66	.824
Left forelimb circumference (cm)	8.29 ± 0.94	7.91 ± 0.96	.103
Right forelimb circumference (cm)	8.05 ± 0.91	8.12 ± 0.89	.621
Left hindlimb circumference (cm)	9.22 ± 1.01	8.93 ± 1.12	.242
Right hindlimb circumference (cm)	9.03 ± 1.08	8.82 ± 0.95	.416
Left proximal hindlimb circumference (cm)	24.60 ± 4.04	23.30 ± 2.80	.152
Right proximal hindlimb circumference (cm)	25.95 ± 4.30	23.72 ± 3.36	.026
Thoracic circumference (cm)	40.34 ± 4.93	39.28 ± 4.84	.378
Pelvic circumference (cm)	41.00 ± 7.04	38.48 ± 6.73	.141
Body length (cm)	53.30 ± 5.14	53.28 ± 2.71	.983
Forelimb height (cm)	26.70 ± 3.13	36.93 ± 3.04	.764
Hindlimb height (cm)	29.61 ± 3.29	28.14 ± 3.04	.062