condition mean min max ZT0-3 3.4951355939999997 3.445541839 3.544729349 ZT4-7 3.4669631062499997 3.1901311029999997 3.7437951094999997 ZT8-11 8.067999594 6.248539935499999 9.887459252500001 ZT12-15 19.159635205 16.12225266 22.19701775 ZT16-19 26.1785999175 21.966674320000003 30.390525515 ZT20-23 55.1947543425 42.671484535000005 67.71802414999999