condition mean min max ZT0-3 463.48133333333334 334.619 558.951 ZT4-7 306.1915 306.1915 306.1915 ZT8-11 270.453 270.453 270.453 ZT12-15 301.20475 284.4445 317.96500000000003 ZT16-19 356.50250000000005 356.50250000000005 356.50250000000005 ZT20-23 531.2445 531.2445 531.2445