condition mean min max ZT0-3 21.25 21.25 21.25 ZT4-7 21.4 21.4 21.4 ZT8-11 43.400000000000006 43.400000000000006 43.400000000000006 ZT12-15 20.35 20.35 20.35 ZT16-19 29.85 29.85 29.85 ZT20-23 25.95 25.95 25.95