condition mean min max ZT0-3 1.56056875 1.1798725 1.941265 ZT4-7 0.88491 0.88491 0.88491 ZT8-11 0.2000535 0.2000535 0.2000535 ZT12-15 0 0 0 ZT16-19 0.096889 0.096889 0.096889 ZT20-23 0.872632 0.872632 0.872632