condition mean min max ZT0-3 25.1 25.1 25.1 ZT4-7 3.7 3.7 3.7 ZT8-11 28.65 28.65 28.65 ZT12-15 27.299999999999997 27.299999999999997 27.299999999999997 ZT16-19 41.95 41.95 41.95 ZT20-23 14.100000000000001 14.100000000000001 14.100000000000001