condition mean min max ZT0-3 16.8 16.8 16.8 ZT4-7 0.8 0.8 0.8 ZT8-11 12.299999999999999 12.299999999999999 12.299999999999999 ZT12-15 2.1 2.1 2.1 ZT16-19 15.05 15.05 15.05 ZT20-23 4.65 4.65 4.65