condition mean min max ZT0-3 252.133248 252.133248 252.133248 ZT4-7 343.8135185 343.8135185 343.8135185 ZT8-11 484.245999 484.245999 484.245999 ZT12-15 462.5990345 462.5990345 462.5990345 ZT16-19 700.991299 700.991299 700.991299 ZT20-23 609.6329325 609.6329325 609.6329325