condition mean min max ZT0-3 2.4078925 2.39607 2.419715 ZT4-7 2.38287 2.38287 2.38287 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 3.193775 3.193775 3.193775