condition mean min max ZT0-3 33.45 33.45 33.45 ZT4-7 42.6 42.6 42.6 ZT8-11 7.9 7.9 7.9 ZT12-15 48.400000000000006 48.400000000000006 48.400000000000006 ZT16-19 45.15 45.15 45.15 ZT20-23 18.25 18.25 18.25