condition mean min max ZT0-3 30.324325 26.652 33.99665 ZT4-7 25.1034 25.1034 25.1034 ZT8-11 17.646250000000002 17.646250000000002 17.646250000000002 ZT12-15 0 0 0 ZT16-19 24.04235 24.04235 24.04235 ZT20-23 21.7701 21.7701 21.7701