condition mean min max ZT0-3 9.299908212250001 8.356800142 10.243016282500001 ZT4-7 4.96081917375 3.6146450825 6.306993265000001 ZT8-11 4.521438014999999 3.2845780125 5.7582980175 ZT12-15 8.94172225825 7.36337027 10.520074246499998 ZT16-19 12.8239713925 11.68568905 13.962253735 ZT20-23 14.508247467499999 14.031402929999999 14.985092005