condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 10.514725 3.413915 17.615535 ZT16-19 0.0 0.0 0.0 ZT20-23 5.34165 5.34165 5.34165