condition mean min max ZT0-3 0.5214805 0.2642855 0.7786755 ZT4-7 0.44997 0.44997 0.44997 ZT8-11 0.568349 0.568349 0.568349 ZT12-15 0 0 0 ZT16-19 1.485505 1.485505 1.485505 ZT20-23 0.9333515 0.9333515 0.9333515