condition mean min max ZT0-3 26.1979553675 20.204999165 32.19091157 ZT4-7 10.22975715275 8.616747505500001 11.842766800000001 ZT8-11 7.9624571765 6.791079570000001 9.133834783 ZT12-15 2.30984092825 1.5896281795 3.0300536769999997 ZT16-19 2.116998543 1.5414151515 2.6925819344999997 ZT20-23 4.396926425 4.378925344500001 4.4149275055