condition mean min max ZT0-3 0.6816773333333334 0.5741695 0.785068 ZT4-7 0.384359 0.384359 0.384359 ZT8-11 0.32205649999999997 0.32205649999999997 0.32205649999999997 ZT12-15 0.78628975 0.399464 1.1731155 ZT16-19 0.30540900000000004 0.30540900000000004 0.30540900000000004 ZT20-23 0.6890775 0.6890775 0.6890775