condition mean min max ZT0-3 2.3443 1.955325 2.733275 ZT4-7 2.510305 2.510305 2.510305 ZT8-11 2.666945 2.666945 2.666945 ZT12-15 0 0 0 ZT16-19 4.1586300000000005 4.1586300000000005 4.1586300000000005 ZT20-23 2.885475 2.885475 2.885475