condition mean min max ZT0-3 24.4 24.4 24.4 ZT4-7 24.4 24.4 24.4 ZT8-11 61.599999999999994 61.599999999999994 61.599999999999994 ZT12-15 29.6 29.6 29.6 ZT16-19 36.400000000000006 36.400000000000006 36.400000000000006 ZT20-23 6.95 6.95 6.95