condition mean min max ZT0-3 0.80507425 0.5677570000000001 1.0423915 ZT4-7 0.7311255 0.7311255 0.7311255 ZT8-11 1.2459305 1.2459305 1.2459305 ZT12-15 0 0 0 ZT16-19 1.2309975 1.2309975 1.2309975 ZT20-23 1.029627 1.029627 1.029627