condition mean min max ZT0-3 24.96794247575 9.8154158815 40.12046907 ZT4-7 6.0192494852500005 5.5006334715 6.5378654990000005 ZT8-11 5.295505562500001 4.755089013 5.835922112 ZT12-15 5.8264015462500005 5.492491441 6.1603116515 ZT16-19 3.81355046375 3.120091981 4.5070089465 ZT20-23 5.826104966 5.545295341 6.106914591