condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 1.974225 1.974225 1.974225 ZT8-11 1.612005 1.612005 1.612005 ZT12-15 2.611475 2.611475 2.611475 ZT16-19 3.441595 3.441595 3.441595 ZT20-23 1.72468 1.72468 1.72468