condition mean min max ZT0-3 0.894515 0.8720945 0.9169354999999999 ZT4-7 0.619664 0.619664 0.619664 ZT8-11 0.52418 0.52418 0.52418 ZT12-15 0 0 0 ZT16-19 0.918302 0.918302 0.918302 ZT20-23 0.853906 0.853906 0.853906