<p>'season': The season that burden levels are calculated for.</p></li>
<li><p>'high_conf_level': (only for intensity_level method) The conf_level chosen for the high level.</p></li>
<li><p>'conf_levels': (only for peak_level method) The conf_levels chosen to fit the 'low', 'medium', 'high' levels.</p></li>
<li><p>'values': A named vector with values for 'very low', 'low', 'medium', 'high' levels.</p></li>
<li><p>'optim' A list containing:</p><ul><li><p>'par': The fit parameters for the chosen family.</p><u