condition mean min max ZT0-3 14.517296 14.517296 14.517296 ZT4-7 14.3647995 14.3647995 14.3647995 ZT8-11 16.351245 16.351245 16.351245 ZT12-15 14.118333 14.118333 14.118333 ZT16-19 14.5890545 14.5890545 14.5890545 ZT20-23 15.998091500000001 15.998091500000001 15.998091500000001