condition mean min max ZT0-3 1.016664 0.753058 1.28027 ZT4-7 1.2651795000000001 1.2651795000000001 1.2651795000000001 ZT8-11 0.7999890000000001 0.7999890000000001 0.7999890000000001 ZT12-15 0 0 0 ZT16-19 1.3180775 1.3180775 1.3180775 ZT20-23 2.0664800000000003 2.0664800000000003 2.0664800000000003