condition mean min max ZT0-3 0.04677615 0.0 0.0935523 ZT4-7 0.62569925 0.62569925 0.62569925 ZT8-11 0.2396678 0.2396678 0.2396678 ZT12-15 0 0 0 ZT16-19 0.419679 0.419679 0.419679 ZT20-23 0.2339795 0.2339795 0.2339795