condition mean min max ZT0-3 24.95 24.95 24.95 ZT4-7 8.8 8.8 8.8 ZT8-11 29.599999999999998 29.599999999999998 29.599999999999998 ZT12-15 36.5 36.5 36.5 ZT16-19 75.55 75.55 75.55 ZT20-23 34.400000000000006 34.400000000000006 34.400000000000006