condition mean min max ZT0-3 0.74884 0.74884 0.74884 ZT4-7 0.2031135 0.2031135 0.2031135 ZT8-11 0.571083 0.571083 0.571083 ZT12-15 0.582704 0.582704 0.582704 ZT16-19 0.412872 0.412872 0.412872 ZT20-23 0.969749 0.969749 0.969749