condition mean min max ZT0-3 63.04775 60.0574 66.33505 ZT4-7 51.10405 51.10405 51.10405 ZT8-11 32.32065 32.32065 32.32065 ZT12-15 34.3765 27.07325 41.67975 ZT16-19 26.60555 26.60555 26.60555 ZT20-23 36.4159 36.4159 36.4159