condition mean min max ZT0-3 0.0285261 0.0285261 0.0285261 ZT4-7 0.0 0.0 0.0 ZT8-11 0.03627125 0.03627125 0.03627125 ZT12-15 0.04387385 0.04387385 0.04387385 ZT16-19 0.03981295 0.03981295 0.03981295 ZT20-23 0.0289753 0.0289753 0.0289753