condition mean min max ZT0-3 2060.723035 2060.723035 2060.723035 ZT4-7 797.9168540000001 797.9168540000001 797.9168540000001 ZT8-11 714.432674 714.432674 714.432674 ZT12-15 612.8069575 612.8069575 612.8069575 ZT16-19 1141.1179425 1141.1179425 1141.1179425 ZT20-23 674.0253765 674.0253765 674.0253765