condition mean min max ZT0-3 0.0104639 0.0104639 0.0104639 ZT4-7 0.0244281 0.0244281 0.0244281 ZT8-11 0.024924545 0.024924545 0.024924545 ZT12-15 0.054598 0.054598 0.054598 ZT16-19 0.11726519999999999 0.11726519999999999 0.11726519999999999 ZT20-23 0.05034575 0.05034575 0.05034575