condition mean min max ZT0-3 1140.700639 1140.700639 1140.700639 ZT4-7 650.7483804999999 650.7483804999999 650.7483804999999 ZT8-11 540.478896 540.478896 540.478896 ZT12-15 554.4843225 554.4843225 554.4843225 ZT16-19 729.1035254999999 729.1035254999999 729.1035254999999 ZT20-23 712.247393 712.247393 712.247393