Table 1 PABA recovery and reference range calculations

From: Validation of the use of p-aminobenzoic acid to determine completeness of 24 h urine collections in surveys of diet and nutrition

Assay method

HPLC a

Colorimetry b

n

47

45

Mean (% dose excreted)

86.5

102

SD (% dose excreted)

8.1

8.84

Mean–2SD (% dose excreted)

70

84

Mean − 3 SD (% dose excreted)

62

75

Mean + 2 SD (% dose excreted)

103

120

±2 SD range (% dose excreted)

70–103

84–120

  1. a Including between-batch analytical SD (6 mg/l) in total SD
  2. b Excluding two urines containing paracetamol
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