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 1.69009 0.0 3.38018 ZT16-19 0.0 0.0 0.0 ZT20-23 3.427775 3.427775 3.427775