condition mean min max ZT0-3 0.03319155 0.03319155 0.03319155 ZT4-7 0.0842985 0.0842985 0.0842985 ZT8-11 0.0 0.0 0.0 ZT12-15 0.11086 0.11086 0.11086 ZT16-19 0.0733134 0.0733134 0.0733134 ZT20-23 0.03644605 0.03644605 0.03644605