condition mean min max ZT0-3 9.899999999999999 9.899999999999999 9.899999999999999 ZT4-7 15.0 15.0 15.0 ZT8-11 7.95 7.95 7.95 ZT12-15 13.799999999999999 13.799999999999999 13.799999999999999 ZT16-19 29.35 29.35 29.35 ZT20-23 1.15 1.15 1.15