condition mean min max ZT0-3 0.0137816 0.0 0.02730735 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0271619 0.0271619 0.0271619 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0146541 0.0146541 0.0146541 ZT20-23 0.0 0.0 0.0