condition mean min max ZT0-3 0.261825 0.0 0.52365 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.2571465 0.2571465 0.2571465 ZT20-23 0.2578665 0.2578665 0.2578665