condition mean min max ZT0-3 206.810541 206.810541 206.810541 ZT4-7 359.191329 359.191329 359.191329 ZT8-11 360.95835850000003 360.95835850000003 360.95835850000003 ZT12-15 356.0304105 356.0304105 356.0304105 ZT16-19 321.572004 321.572004 321.572004 ZT20-23 335.8560965 335.8560965 335.8560965