condition mean min max ZT0-3 14.899999999999999 14.899999999999999 14.899999999999999 ZT4-7 0.8 0.8 0.8 ZT8-11 10.2 10.2 10.2 ZT12-15 1.9 1.9 1.9 ZT16-19 21.05 21.05 21.05 ZT20-23 10.7 10.7 10.7