A comparison of self-reported analgesic use and detection of urinary ibuprofen and acetaminophen metabolites by means of metabonomics: the INTERMAP Study.
Information on dietary supplements, medications, and other xenobiotics in epidemiologic surveys is usually obtained from questionnaires and is subject to recall and reporting biases. The authors used metabolite data obtained from hydrogen-1 (or proton) nuclear magnetic resonance ((1)H NMR) analysis of human urine specimens from the International Study of Macro-/Micro-Nutrients and Blood Pressure (INTERMAP Study) to validate self-reported analgesic use. Metabolic profiling of two 24-hour urine specimens per individual was carried out for 4,630 participants aged 40-59 years from 17 population samples in Japan, China, the United Kingdom, and the United States (data collection, 1996-1999). (1)H NMR-detected acetaminophen and ibuprofen use was low (∼4%) among East Asian population samples and higher (>16%) in Western population samples. In a comparison of self-reported acetaminophen and ibuprofen use with (1)H NMR-detected acetaminophen and ibuprofen metabolites among 496 participants from Chicago, Illinois, and Belfast, Northern Ireland, the overall rate of concordance was 81%-84%; the rate of underreporting was 15%-17%; and the rate of underdetection was approximately 1%. Comparison of self-reported unspecified analgesic use with (1)H NMR-detected acetaminophen and ibuprofen metabolites among 2,660 Western INTERMAP participants revealed similar levels of concordance and underreporting. Screening for urinary metabolites of acetaminophen and ibuprofen improved the accuracy of exposure information. This approach has the potential to reduce recall bias and other biases in epidemiologic studies for a range of substances, including pharmaceuticals, dietary supplements, and foods.
Clinical and Professional Practice Division, Medway School of Pharmacy, Universities of Kent and Greenwich, Kent, United Kingdom.
Ruey Leng
RL
Loo
Queenie
Q
Chan
Ian J
IJ
Brown
Claire E
CE
Robertson
Jeremiah
J
Stamler
Jeremy K
JK
Nicholson
Elaine
E
Holmes
Paul
P
Elliott
D000082:Acetaminophen / Q000378:metabolism / Q000627:therapeutic use / Q000652:urine*; D000328:Adult; D018712:Analgesics, Non-Narcotic / Q000378:metabolism / Q000627:therapeutic use / Q000652:urine*; D015982:Bias; D015340:Epidemiologic Research Design; D005260:Female; D006801:Humans; D007052:Ibuprofen / Q000378:metabolism / Q000627:therapeutic use / Q000652:urine*; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D055432:Metabolomics; D008875:Middle Aged; D015999:Multivariate Analysis; D017891:Pharmacoepidemiology / Q000379:methods*; D057566:Self Report
D018712:Analgesics, Non-Narcotic; D000082:Acetaminophen; D007052:Ibuprofen