condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0098124125 0.0 0.019624825 ZT16-19 0.020732 0.0 0.041464 ZT20-23 0 0 0