condition mean min max ZT0-3 0.0775285 0.0 0.152871 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.07220425 0.071311 0.0730975 ZT16-19 0.0 0.0 0.0 ZT20-23 0.079861 0.079861 0.079861