condition mean min max ZT0-3 2.70859 2.55898 2.8582 ZT4-7 1.5805695 1.5805695 1.5805695 ZT8-11 1.273724 1.273724 1.273724 ZT12-15 0 0 0 ZT16-19 1.41476 1.41476 1.41476 ZT20-23 2.372325 2.372325 2.372325