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. Author manuscript; available in PMC: 2012 Mar 1.
Published in final edited form as: Evol Hum Behav. 2011 Mar 1;32(2):79–89. doi: 10.1016/j.evolhumbehav.2010.08.002

Figure 1.

Figure 1

Median age of first birth by the number of years the father was alive during childhood for men and women.

Sample sizes for sons are 17, 16, 19 and 405 for the age brackets 0–4, 5–9, 10–14 and 15+ respectively. For daughters, these numbers are 20, 17, 23 and 409. Error bars represent standard errors.