condition mean min max ZT0-3 107.101369 107.101369 107.101369 ZT4-7 491.970182 491.970182 491.970182 ZT8-11 652.241579 652.241579 652.241579 ZT12-15 575.3839875 575.3839875 575.3839875 ZT16-19 466.15903000000003 466.15903000000003 466.15903000000003 ZT20-23 336.5118335 336.5118335 336.5118335