condition mean min max ZT0-3 3.438835 3.438835 3.438835 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 2.87143 2.87143 2.87143 ZT16-19 3.811535 3.811535 3.811535 ZT20-23 0.0 0.0 0.0