condition mean min max ZT0-3 0.96593525 0.5973425 1.3345280000000002 ZT4-7 1.064185 1.064185 1.064185 ZT8-11 0.295226 0.295226 0.295226 ZT12-15 0 0 0 ZT16-19 0.735575 0.735575 0.735575 ZT20-23 0.737206 0.737206 0.737206