condition mean min max ZT0-3 15.121099999999998 15.121099999999998 15.121099999999998 ZT4-7 11.15685 11.15685 11.15685 ZT8-11 10.602 10.602 10.602 ZT12-15 11.94275 11.94275 11.94275 ZT16-19 14.473199999999999 14.473199999999999 14.473199999999999 ZT20-23 16.4224 16.4224 16.4224