condition mean min max ZT0-3 517.675573 517.675573 517.675573 ZT4-7 487.7323295 487.7323295 487.7323295 ZT8-11 404.031923 404.031923 404.031923 ZT12-15 440.788641 440.788641 440.788641 ZT16-19 412.67370800000003 412.67370800000003 412.67370800000003 ZT20-23 428.590354 428.590354 428.590354