condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.081694047 0.0 0.163388094 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.06936172766666666 0.050669021 0.08805443433333333 ZT20-23 0.0 0.0 0.0