condition mean min max ZT0-3 1.2453913333333333 0.819724 1.60141 ZT4-7 0.8728365 0.8728365 0.8728365 ZT8-11 1.0583844999999998 1.0583844999999998 1.0583844999999998 ZT12-15 2.009265 1.9696099999999999 2.04892 ZT16-19 1.607445 1.607445 1.607445 ZT20-23 2.370115 2.370115 2.370115