condition mean min max ZT0-3 3.79762 3.79762 3.79762 ZT4-7 2.78385 2.78385 2.78385 ZT8-11 3.40261 3.40261 3.40261 ZT12-15 2.7443299999999997 2.7443299999999997 2.7443299999999997 ZT16-19 5.68748 5.68748 5.68748 ZT20-23 4.4596599999999995 4.4596599999999995 4.4596599999999995