condition mean min max ZT0-3 0.34023925 0.2535775 0.42690100000000003 ZT4-7 0.0840605 0.0840605 0.0840605 ZT8-11 0.3422765 0.3422765 0.3422765 ZT12-15 0 0 0 ZT16-19 0.1681315 0.1681315 0.1681315 ZT20-23 0.4233835 0.4233835 0.4233835