condition mean min max ZT0-3 5.6000000000000005 5.6000000000000005 5.6000000000000005 ZT4-7 5.2 5.2 5.2 ZT8-11 3.2 3.2 3.2 ZT12-15 3.55 3.55 3.55 ZT16-19 17.3 17.3 17.3 ZT20-23 26.299999999999997 26.299999999999997 26.299999999999997