Number of cycles of attempted conception required for various indicators of subfertility to be attained, for examples 1, 2, 3 and 4.

<p>The characteristics of the populations for examples 1, 2, 3 and 4 are described in the legends of <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0046544#pone-0046544-t002" target="_blank">Tables 2</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0046544#pone-0046544-t003" target="_blank">3</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0046544#pone-0046544-t004" target="_blank">4</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0046544#pone-0046544-t005" target="_blank">5</a>, and in the text.