condition mean min max ZT0-3 21.6714718025 21.257114655000002 22.08582895 ZT4-7 6.3485342945 4.95251779 7.744550799 ZT8-11 2.92383467175 2.5418188844999996 3.305850459 ZT12-15 6.97893161025 4.9398580095 9.018005211 ZT16-19 8.97789586825 7.613439531499999 10.342352205000001 ZT20-23 18.3749612525 16.821019370000002 19.928903135