condition mean min max ZT0-3 108.511505 108.511505 108.511505 ZT4-7 48.135329 48.135329 48.135329 ZT8-11 48.7268035 48.7268035 48.7268035 ZT12-15 89.1998625 89.1998625 89.1998625 ZT16-19 72.2197045 72.2197045 72.2197045 ZT20-23 135.5065305 135.5065305 135.5065305