condition mean min max ZT0-3 1.313764 1.237028 1.3904999999999998 ZT4-7 0.8873015 0.8873015 0.8873015 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.6945475 0.6945475 0.6945475 ZT20-23 1.614785 1.614785 1.614785