condition mean min max ZT0-3 11.533945 11.533945 11.533945 ZT4-7 10.883190500000001 10.883190500000001 10.883190500000001 ZT8-11 11.3375095 11.3375095 11.3375095 ZT12-15 11.3458565 11.3458565 11.3458565 ZT16-19 11.7810875 11.7810875 11.7810875 ZT20-23 11.6774795 11.6774795 11.6774795