condition mean min max ZT0-3 4.285159999999999 3.83922 4.7311 ZT4-7 4.714074999999999 4.714074999999999 4.714074999999999 ZT8-11 3.07453 3.07453 3.07453 ZT12-15 0 0 0 ZT16-19 10.92413 10.92413 10.92413 ZT20-23 5.44789 5.44789 5.44789