condition mean min max ZT0-3 74.9425673925 47.253775185 102.6313596 ZT4-7 41.180404912499995 35.580656635 46.78015319 ZT8-11 50.7072573275 50.38446939 51.030045265 ZT12-15 21.02103949325 11.6741388915 30.367940095 ZT16-19 7.18644242825 6.2945374945 8.078347362 ZT20-23 4.939413857750001 4.463206438 5.4156212775000006