condition mean min max ZT0-3 6.77382 6.27825 7.26939 ZT4-7 5.574145 5.574145 5.574145 ZT8-11 4.8192699999999995 4.8192699999999995 4.8192699999999995 ZT12-15 0 0 0 ZT16-19 6.632125 6.632125 6.632125 ZT20-23 7.892545 7.892545 7.892545