Estimated proportion of heterosexual persons in the United States, by survey and combined by meta-analysis.

<p>* I<sup>2</sup> = 81.1; Q = 10.6, p = 0.005</p><p><sup>†</sup> I<sup>2</sup> = 88.1; Q = 16.8, p <0.001</p><p><sup>§</sup> I<sup>2</sup> = 91.6; Q = 23.7, p < 0.001. CI = confidence interval. GSS = General Social Survey (2010); NHANES = National Health and Nutrition Examination Survey (2009–2010); NSFG = National Survey of Family Growth (2006–2010). See <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0133543#pone.0133543.t001" target="_blank">Table 1</a> for description of each survey.</p><p>Estimated proportion of heterosexual persons in the United States, by survey and combined by meta-analysis.</p>