condition mean min max ZT0-3 0.0554844 0.0554844 0.0554844 ZT4-7 0.03502425 0.03502425 0.03502425 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0924672 0.0924672 0.0924672 ZT20-23 0.0 0.0 0.0