condition mean min max ZT0-3 25.6579 25.6579 25.6579 ZT4-7 19.1132 19.1132 19.1132 ZT8-11 15.53765 15.53765 15.53765 ZT12-15 18.842399999999998 18.842399999999998 18.842399999999998 ZT16-19 27.72185 27.72185 27.72185 ZT20-23 29.50545 29.50545 29.50545