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 0.476579 0.172275 0.780883 ZT16-19 0.352114 0.352114 0.352114 ZT20-23 0.503682 0.503682 0.503682