condition mean min max ZT0-3 6.388812499999999 5.7877849999999995 6.989839999999999 ZT4-7 5.302575 5.302575 5.302575 ZT8-11 9.108339999999998 9.108339999999998 9.108339999999998 ZT12-15 0 0 0 ZT16-19 12.3598 12.3598 12.3598 ZT20-23 8.480355 8.480355 8.480355