condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0337974 0.0337974 0.0337974 ZT8-11 0.08251485 0.08251485 0.08251485 ZT12-15 0 0 0 ZT16-19 0.06521805 0.06521805 0.06521805 ZT20-23 0.08208295 0.08208295 0.08208295