condition mean min max ZT0-3 9.96884 9.881515 10.056165 ZT4-7 3.284715 3.284715 3.284715 ZT8-11 7.200545 7.200545 7.200545 ZT12-15 0 0 0 ZT16-19 11.32348 11.32348 11.32348 ZT20-23 5.39895 5.39895 5.39895