condition mean min max ZT0-3 0.3234616666666667 0.0 0.970385 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.4865725 0.0 0.973145 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0