condition mean min max ZT0-3 40.2 40.2 40.2 ZT4-7 35.7 35.7 35.7 ZT8-11 56.75 56.75 56.75 ZT12-15 45.400000000000006 45.400000000000006 45.400000000000006 ZT16-19 57.55 57.55 57.55 ZT20-23 32.5 32.5 32.5