condition mean min max ZT0-3 3.8232875 2.89587 4.750705 ZT4-7 5.85909 5.85909 5.85909 ZT8-11 3.06171 3.06171 3.06171 ZT12-15 0 0 0 ZT16-19 4.337845 4.337845 4.337845 ZT20-23 6.147819999999999 6.147819999999999 6.147819999999999