condition mean min max ZT0-3 13.6 13.6 13.6 ZT4-7 9.3 9.3 9.3 ZT8-11 27.9 27.9 27.9 ZT12-15 24.299999999999997 24.299999999999997 24.299999999999997 ZT16-19 35.1 35.1 35.1 ZT20-23 18.2 18.2 18.2