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. Author manuscript; available in PMC: 2015 Apr 20.
Published in final edited form as: Psychoneuroendocrinology. 2014 Apr 30;46:153–163. doi: 10.1016/j.psyneuen.2014.04.014

Figure 1.

Figure 1

Differences between fathers and non-fathers in plasma levels of a. Oxytocin (t(128) = −3.93, p < 0.0005), and b. Testosterone ((t(129) = 4.02, p < 0.0001).