condition mean min max ZT0-3 0.0056917 0.0056917 0.0056917 ZT4-7 0.0275103 0.0275103 0.0275103 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0115424 0.0115424 0.0115424 ZT20-23 0.0285318 0.0285318 0.0285318