condition mean min max ZT0-3 3.369085 2.735235 4.002935 ZT4-7 16.70035 16.70035 16.70035 ZT8-11 5.96416 5.96416 5.96416 ZT12-15 0 0 0 ZT16-19 0.5938915 0.5938915 0.5938915 ZT20-23 1.57702 1.57702 1.57702