condition mean min max ZT0-3 14.688133333333333 11.580300000000001 16.8876 ZT4-7 9.69002 9.69002 9.69002 ZT8-11 8.83075 8.83075 8.83075 ZT12-15 11.94815 10.77785 13.11845 ZT16-19 13.771550000000001 13.771550000000001 13.771550000000001 ZT20-23 17.515050000000002 17.515050000000002 17.515050000000002