condition mean min max ZT0-3 1.1428611666666666 0.5496685 1.52215 ZT4-7 1.0289329999999999 1.0289329999999999 1.0289329999999999 ZT8-11 2.00456 2.00456 2.00456 ZT12-15 1.7549685 1.137227 2.3727099999999997 ZT16-19 1.652395 1.652395 1.652395 ZT20-23 2.2970800000000002 2.2970800000000002 2.2970800000000002