condition mean min max ZT0-3 13.37574483325 12.888476896499999 13.86301277 ZT4-7 13.996371665 13.640507456666667 14.352235873333333 ZT8-11 11.8139494595 10.896051231 12.731847688 ZT12-15 11.7816564835 10.698996587 12.86431638 ZT16-19 12.319032518833332 11.616517369999999 13.021547667666667 ZT20-23 11.548941859500001 10.129542375666666 12.968341343333334