condition mean min max ZT0-3 0.622455 0.622455 0.622455 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 0.0 0.0 0.0 ZT20-23 0.62669 0.62669 0.62669