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. Author manuscript; available in PMC: 2012 Jun 2.
Published in final edited form as: Psychosom Med. 2011 Jun 2;73(5):393–400. doi: 10.1097/PSY.0b013e31821df0c2

Figure 1.

Figure 1

Comparison of oxytocin levels in plasma (n = 39) with and without extraction. One milliliter of plasma was extracted using 200 mg C18 Sep-Pak columns as described in the Methods. Oxytocin levels in plasma (diluted 1:4 before assay) and the corresponding extract were assayed by the EIA method, and the results are expressed as pg/mL of the original plasma volume. Five of 39 samples had values below the limit of detection and were assigned a value of 0.1 pg/mL for the statistical analysis. Correlation was determined using the Pearson correlation coefficient.