condition mean min max ZT0-3 31.096595777500003 28.377845235000002 33.81534632 ZT4-7 31.362383755000003 31.095075910000002 31.6296916 ZT8-11 36.29886182 35.61728295333333 36.98044068666666 ZT12-15 37.70964583833333 35.665348073333334 39.75394360333333 ZT16-19 29.091074585 25.78297795 32.39917122 ZT20-23 21.73294245 20.174143139999998 23.29174176