condition mean min max ZT0-3 3067.301989 3067.301989 3067.301989 ZT4-7 4495.36117 4495.36117 4495.36117 ZT8-11 4162.321416500001 4162.321416500001 4162.321416500001 ZT12-15 3180.5438265000003 3180.5438265000003 3180.5438265000003 ZT16-19 2249.4199135 2249.4199135 2249.4199135 ZT20-23 1878.1319720000001 1878.1319720000001 1878.1319720000001