condition mean min max ZT0-3 433.159691 433.159691 433.159691 ZT4-7 495.7015875 495.7015875 495.7015875 ZT8-11 479.4859425 479.4859425 479.4859425 ZT12-15 531.6126115 531.6126115 531.6126115 ZT16-19 396.38540850000004 396.38540850000004 396.38540850000004 ZT20-23 403.393651 403.393651 403.393651