condition mean min max ZT0-3 23.35175 22.1006 24.602899999999998 ZT4-7 23.714750000000002 23.714750000000002 23.714750000000002 ZT8-11 28.7066 28.7066 28.7066 ZT12-15 0 0 0 ZT16-19 24.03015 24.03015 24.03015 ZT20-23 21.22055 21.22055 21.22055