condition mean min max ZT0-3 1.2009781666666668 0.6493995 1.501825 ZT4-7 0.9252425 0.9252425 0.9252425 ZT8-11 0.6441915 0.6441915 0.6441915 ZT12-15 0.82622525 0.8032185000000001 0.849232 ZT16-19 0.8033954999999999 0.8033954999999999 0.8033954999999999 ZT20-23 1.4733749999999999 1.4733749999999999 1.4733749999999999