condition mean min max ZT0-3 28.55175 28.55175 28.55175 ZT4-7 22.19475 22.19475 22.19475 ZT8-11 17.27545 17.27545 17.27545 ZT12-15 22.3134 22.3134 22.3134 ZT16-19 27.108249999999998 27.108249999999998 27.108249999999998 ZT20-23 28.2955 28.2955 28.2955