condition mean min max ZT0-3 27.9 27.9 27.9 ZT4-7 12.1 12.1 12.1 ZT8-11 9.05 9.05 9.05 ZT12-15 34.4 34.4 34.4 ZT16-19 27.8 27.8 27.8 ZT20-23 9.899999999999999 9.899999999999999 9.899999999999999