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 0 0 0 ZT16-19 3.02146 3.02146 3.02146 ZT20-23 3.05545 3.05545 3.05545