condition mean min max ZT0-3 17.299999999999997 17.299999999999997 17.299999999999997 ZT4-7 10.7 10.7 10.7 ZT8-11 10.3 10.3 10.3 ZT12-15 37.5 37.5 37.5 ZT16-19 4.45 4.45 4.45 ZT20-23 5.2 5.2 5.2