condition mean min max ZT0-3 5.933045571083333 5.3697434395 6.496347702666666 ZT4-7 10.229730909166665 5.762895794 14.696566024333332 ZT8-11 29.553842080000003 24.25036467 34.85731949 ZT12-15 32.31783502 29.489410496666668 35.14625954333333 ZT16-19 41.50292107666667 35.89281782333333 47.11302433 ZT20-23 55.227930415 49.6292736 60.82658723