condition mean min max ZT0-3 29.9085194325 27.89540076 31.921638105 ZT4-7 25.0064714825 24.54220497 25.470737995 ZT8-11 27.4390276025 25.472210185 29.40584502 ZT12-15 29.035112045 25.455791665 32.614432425000004 ZT16-19 25.6213807775 23.74582311 27.496938444999998 ZT20-23 15.9748093325 13.884483464999999 18.0651352