Table I.

Results of 2-sample t-tests of values for biochemical parameters in the serum of healthy and hyperthyroid cats

	Mean value (and standard deviation)
	Healthy cats	Hyperthyroid cats	P-value
Ionized magnesium concentration (mmol/L)	0.55 (0.040)	0.54 (0.054)	0.271
Total magnesium concentration (mmol/L)	0.93 (0.081)	0.95 (0.11)	0.436
Potassium concentration (mmol/L)	4.12 (0.34)	4.21 (0.58)	0.589
Total calcium concentration (mmol/L)	2.57 (0.11)	2.60 (0.16)	0.500
Ionized:total magnesium concentrations	0.60 (0.037)	0.56 (0.027)	0.000a
Total protein concentration (g/L)	72.5 (5.13)	67.4 (5.03)	0.003a
pH	7.46 (0.033)	7.38 (0.16)	0.073

^aSignificant at P < 0.05