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Table 7 Urea and creatinine concentrations in the blood of cats fed diets with varying protein concentrations and qualities. n = 10 / diet, Mean and SEM

From: Influence of protein concentration and quality in a canned diet on urine composition, apparent nutrient digestibility and energy supply in adult cats

     P values (polynomial contrasts)
  Low protein quality High protein quality SEM Interaction Low protein quality High protein quality Protein concentration Protein quality
  36.7% 45.0% 56.1% 36.2% 43.3% 54.9%    Lin. Quadr. Lin. Quadr. Lin. Quadr.  
Urea (mmol/l) 7.99 8.77 9.56 7.89 8.45 9.60 0.17 0.453 < 0.001 0.539 0.839
Creatinine (μmol/l) 151 153 142 160 150 149 2.69 0.432 0.004 0.711 0.112
  1. Reference range for urea: 5.0–11.3 mmol/l; reference range for creatinine: 0–168 μmol/l (Clinic of Small Animals, Freie Universität Berlin)