condition mean min max ZT0-3 29.143659 29.143659 29.143659 ZT4-7 38.416805000000004 38.416805000000004 38.416805000000004 ZT8-11 39.747524999999996 39.747524999999996 39.747524999999996 ZT12-15 48.7338635 48.7338635 48.7338635 ZT16-19 37.076744000000005 37.076744000000005 37.076744000000005 ZT20-23 39.1467045 39.1467045 39.1467045