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. 2013 Jan 7;280(1750):20122313. doi: 10.1098/rspb.2012.2313

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© 2012 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — Probability of surviving to age 15 years: (a) of males according to their number of elder brothers ( p = 0.008). (b) of males according to their number of elder sisters ( p < 0.001). (c) of females according to their number of elder brothers ( p = 0.001). (d) of females according to their number of elder sisters ( p = 0.31). Figures show predicted values of the model and error bars represent standard errors of the means. The horizontal dashed line represents the predicted value in the case where the individual had no elder brothers or no elder sisters. Numbers below bars represent the sample size.

Inline graphic — Probability of surviving to age 15 years: (a) of males according to their number of elder brothers ( p = 0.008). (b) of males according to their number of elder sisters ( p < 0.001). (c) of females according to their number of elder brothers ( p = 0.001). (d) of females according to their number of elder sisters ( p = 0.31). Figures show predicted values of the model and error bars represent standard errors of the means. The horizontal dashed line represents the predicted value in the case where the individual had no elder brothers or no elder sisters. Numbers below bars represent the sample size.