condition mean min max ZT0-3 0.060648 0.060648 0.060648 ZT4-7 0.0331556 0.0331556 0.0331556 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0938585 0.0938585 0.0938585 ZT16-19 0.041733 0.041733 0.041733 ZT20-23 0.0223029 0.0223029 0.0223029