condition mean min max ZT0-3 48.909625 44.8715 52.94775 ZT4-7 81.9148 81.9148 81.9148 ZT8-11 51.152150000000006 51.152150000000006 51.152150000000006 ZT12-15 0 0 0 ZT16-19 39.603899999999996 39.603899999999996 39.603899999999996 ZT20-23 66.19245000000001 66.19245000000001 66.19245000000001