condition mean min max ZT0-3 2.55716 2.1459650000000003 2.968355 ZT4-7 2.273105 2.273105 2.273105 ZT8-11 2.050695 2.050695 2.050695 ZT12-15 0 0 0 ZT16-19 2.859435 2.859435 2.859435 ZT20-23 2.99558 2.99558 2.99558