condition mean min max ZT0-3 23.79935 21.50105 26.09765 ZT4-7 16.81665 16.81665 16.81665 ZT8-11 23.158499999999997 23.158499999999997 23.158499999999997 ZT12-15 0 0 0 ZT16-19 22.44025 22.44025 22.44025 ZT20-23 25.148249999999997 25.148249999999997 25.148249999999997