condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0173794 0.0173794 0.0173794 ZT12-15 0.02690029583333333 0.022399366666666667 0.031401225 ZT16-19 0.0 0.0 0.0 ZT20-23 0 0 0