condition mean min max ZT0-3 3.23119 3.187645 3.274735 ZT4-7 3.221675 3.221675 3.221675 ZT8-11 4.497355 4.497355 4.497355 ZT12-15 0 0 0 ZT16-19 3.83294 3.83294 3.83294 ZT20-23 4.312665 4.312665 4.312665