condition mean min max ZT0-3 4.3096825 3.58191 5.037455 ZT4-7 2.357545 2.357545 2.357545 ZT8-11 1.89975 1.89975 1.89975 ZT12-15 0 0 0 ZT16-19 8.291145 8.291145 8.291145 ZT20-23 5.37807 5.37807 5.37807