condition mean min max ZT0-3 24.184150000000002 22.967950000000002 25.40035 ZT4-7 15.7926 15.7926 15.7926 ZT8-11 22.834600000000002 22.834600000000002 22.834600000000002 ZT12-15 0 0 0 ZT16-19 32.591300000000004 32.591300000000004 32.591300000000004 ZT20-23 27.195050000000002 27.195050000000002 27.195050000000002