Correlation analyses for leg elevation and trunk inclination angles vs. year.

1<p>Angular values for the analysed positions were averaged across judges prior to analyses; r = Pearson correlation coefficient; N = number of images available.</p>2<p>HS = Highly Skilled postures: postures highly demanding in terms of balance (i.e. the ballerina is not supported by the male dancer) and/or motor constraints (i.e. leg elevation above 90–120 deg).</p>3<p>see an example in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0005023#pone-0005023-g001" target="_blank">Figure 1 A</a>.</p>4<p>see an example in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0005023#pone-0005023-g001" target="_blank">Figure 1B</a>.</p>5<p>LS = Less-skilled postures: postures less demanding in terms of balance (i.e. the ballerina is supported by the male dancer) and/or motor constraints (i.e. leg elevation below 90–120 deg).</p>6<p>see an example in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0005023#pone-0005023-g001" target="_blank">Figure 1C</a>.