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 0.0 0.0 ZT16-19 0.033735833 0.024853876666666667 0.04261778933333333 ZT20-23 0.0 0.0 0.0