condition mean min max ZT0-3 1.0070306666666666 0.5997755 1.27728 ZT4-7 0.9663664999999999 0.9663664999999999 0.9663664999999999 ZT8-11 0.707109 0.707109 0.707109 ZT12-15 1.02416725 0.4323695 1.615965 ZT16-19 1.61294 1.61294 1.61294 ZT20-23 2.2991425 2.2991425 2.2991425