condition mean min max ZT0-3 0.573364 0.573364 0.573364 ZT4-7 0.3225345 0.3225345 0.3225345 ZT8-11 0.2040785 0.2040785 0.2040785 ZT12-15 0.5735794999999999 0.5735794999999999 0.5735794999999999 ZT16-19 1.62659 1.62659 1.62659 ZT20-23 0.9188784999999999 0.9188784999999999 0.9188784999999999