Demographic, sampling- and assay-related confounders of endogenous oxytocin concentrations: A systematic review and meta-analysis
Engel S, Laufer S, Miller R, Niemeyer H, Knaevelsrud C, Schumacher S (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 54
Pages Range: 100775
Article Number: 100775
DOI: 10.1016/j.yfrne.2019.100775
Abstract
Studies on endogenous oxytocin concentrations are often criticized for the debatable comparability between specimens and the variation in reported values. We performed meta-regressions on k = 229 studies (n = 12 741 participants), testing whether specimen, extraction, sex, age, time of day, or fasting instructions influenced oxytocin measurements. Predicted oxytocin concentrations differed depending on specimen and extraction: Measurements were extremely high in unextracted blood, compared to extracted blood and other specimens. Measurements were higher in samples with more female participants and higher age. Instructions not to smoke before sampling were correlated with higher oxytocin in unextracted samples. There was no impact of instructions to refrain from eating, drinking, consume caffeine, alcohol or exercising. Oxytocin concentrations increased from morning to afternoon. Our results showed that oxytocin is differentially reflected in blood, saliva, urine and cerebrospinal fluid. Extraction impacts oxytocin measurements, particularly in blood. Considering relevant confounders might increase comparability between studies.
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Germany (DE)How to cite
APA:
Engel, S., Laufer, S., Miller, R., Niemeyer, H., Knaevelsrud, C., & Schumacher, S. (2019). Demographic, sampling- and assay-related confounders of endogenous oxytocin concentrations: A systematic review and meta-analysis. Frontiers in Neuroendocrinology, 54, 100775. https://doi.org/10.1016/j.yfrne.2019.100775
MLA:
Engel, Sinha, et al. "Demographic, sampling- and assay-related confounders of endogenous oxytocin concentrations: A systematic review and meta-analysis." Frontiers in Neuroendocrinology 54 (2019): 100775.
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