condition mean min max ZT0-3 50.85661666666667 49.9636 51.90155 ZT4-7 40.4982 40.4982 40.4982 ZT8-11 40.207300000000004 40.207300000000004 40.207300000000004 ZT12-15 44.1774 44.1603 44.1945 ZT16-19 34.333749999999995 34.333749999999995 34.333749999999995 ZT20-23 37.02165 37.02165 37.02165