condition mean min max ZT0-3 2.1500775 2.00002 2.300135 ZT4-7 1.619355 1.619355 1.619355 ZT8-11 7.278255 7.278255 7.278255 ZT12-15 0 0 0 ZT16-19 5.96634 5.96634 5.96634 ZT20-23 2.146535 2.146535 2.146535