condition mean min max ZT0-3 0.775144 0.568376 0.981912 ZT4-7 1.3504575 1.3504575 1.3504575 ZT8-11 0.8708465 0.8708465 0.8708465 ZT12-15 0 0 0 ZT16-19 1.178715 1.178715 1.178715 ZT20-23 1.497022 1.497022 1.497022