condition mean min max ZT0-3 416.915331 416.915331 416.915331 ZT4-7 346.246711 346.246711 346.246711 ZT8-11 416.59197500000005 416.59197500000005 416.59197500000005 ZT12-15 454.961009 454.961009 454.961009 ZT16-19 496.3414105 496.3414105 496.3414105 ZT20-23 437.076624 437.076624 437.076624