condition mean min max ZT0-3 1.8757525 1.826735 1.92477 ZT4-7 1.6838700000000002 1.6838700000000002 1.6838700000000002 ZT8-11 2.081005 2.081005 2.081005 ZT12-15 0 0 0 ZT16-19 1.928605 1.928605 1.928605 ZT20-23 2.89032 2.89032 2.89032