Absence of sperm in relation to level of background radiation (model 1) and level of background radiation, keel length and body mass (model 2).
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Abstract
<p>The models had the statistics χ<sup>2</sup> = 68.74, d.f. = 2, <i>r</i><sup>2</sup> = 0.15, <i>P</i><0.0001 and χ<sup>2</sup> = 81.44, d.f. = 4, <i>r</i><sup>2</sup> = 0.18, <i>P</i><0.0001.</p
