condition mean min max ZT0-3 29.66825 29.66825 29.66825 ZT4-7 38.93465 38.93465 38.93465 ZT8-11 27.80725 27.80725 27.80725 ZT12-15 20.263550000000002 20.263550000000002 20.263550000000002 ZT16-19 16.5564 16.5564 16.5564 ZT20-23 22.255499999999998 22.255499999999998 22.255499999999998