condition mean min max ZT0-3 0.0399887 0.0399887 0.0399887 ZT4-7 0.0 0.0 0.0 ZT8-11 0.04461655 0.04461655 0.04461655 ZT12-15 0.02599675 0.02599675 0.02599675 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0