condition mean min max ZT0-3 44.956625 41.216 48.69725 ZT4-7 23.879350000000002 23.879350000000002 23.879350000000002 ZT8-11 25.455 25.455 25.455 ZT12-15 0 0 0 ZT16-19 42.4957 42.4957 42.4957 ZT20-23 40.8887 40.8887 40.8887