condition mean min max ZT0-3 10.792788333333332 9.515464999999999 11.46575 ZT4-7 10.50342 10.50342 10.50342 ZT8-11 15.864650000000001 15.864650000000001 15.864650000000001 ZT12-15 24.4597 24.45915 24.460250000000002 ZT16-19 21.990850000000002 21.990850000000002 21.990850000000002 ZT20-23 19.02115 19.02115 19.02115