condition mean min max ZT0-3 164.64925 156.76749999999998 172.531 ZT4-7 126.05250000000001 126.05250000000001 126.05250000000001 ZT8-11 254.719 254.719 254.719 ZT12-15 0 0 0 ZT16-19 311.6875 311.6875 311.6875 ZT20-23 220.69150000000002 220.69150000000002 220.69150000000002