Concentrations of organic acids in urine

unimodal distribution with detectable values in almost all subjects. 

apparently unimodal distribution with a number of values below the level of detectability. 

clearly bimodal distribution, a unimodal subgroup plus a block of undetectable values. 

irregular distributions with a majority of undetectable values (Chalmers et al, 1976a). 

Acid Concentration range (mg per g of creatinine ) Number of subjects excreting detectable amounts 

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Table 7.14 Concentrations of organic acids in urine from neonates at the ages of 2 days and 5 days (from Aim et aL, 1978).

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