condition mean min max ZT0-3 23.42405 22.013550000000002 24.83455 ZT4-7 26.451050000000002 26.451050000000002 26.451050000000002 ZT8-11 23.60455 23.60455 23.60455 ZT12-15 0 0 0 ZT16-19 29.768549999999998 29.768549999999998 29.768549999999998 ZT20-23 27.49055 27.49055 27.49055