condition mean min max ZT0-3 3.7 3.7 3.7 ZT4-7 22.9 22.9 22.9 ZT8-11 10.9 10.9 10.9 ZT12-15 5.6 5.6 5.6 ZT16-19 5.55 5.55 5.55 ZT20-23 15.299999999999999 15.299999999999999 15.299999999999999