condition mean min max ZT0-3 517.7153496916667 478.55558793333336 556.8751114500001 ZT4-7 515.8767574000001 492.1831112 539.5704036000001 ZT8-11 392.3348272 348.78969010000003 435.8799643 ZT12-15 381.83845945 351.9572081666667 411.71971073333333 ZT16-19 532.1881554666667 521.0163233000001 543.3599876333333 ZT20-23 578.9902058499999 567.4205627 590.559849