condition mean min max ZT0-3 49.400000000000006 49.400000000000006 49.400000000000006 ZT4-7 50.5 50.5 50.5 ZT8-11 38.25 38.25 38.25 ZT12-15 33.2 33.2 33.2 ZT16-19 39.95 39.95 39.95 ZT20-23 33.95 33.95 33.95