condition mean min max ZT0-3 1.250116 1.250116 1.250116 ZT4-7 0.6546624999999999 0.6546624999999999 0.6546624999999999 ZT8-11 0.699292 0.699292 0.699292 ZT12-15 0.9789425 0.9789425 0.9789425 ZT16-19 1.1762125 1.1762125 1.1762125 ZT20-23 1.6957300000000002 1.6957300000000002 1.6957300000000002