condition mean min max ZT0-3 9.3 9.3 9.3 ZT4-7 0.6 0.6 0.6 ZT8-11 1.15 1.15 1.15 ZT12-15 5.05 5.05 5.05 ZT16-19 11.799999999999999 11.799999999999999 11.799999999999999 ZT20-23 3.0 3.0 3.0