condition mean min max ZT0-3 1.53822724375 1.1160021279999999 1.9604523595 ZT4-7 3.1639572869999997 2.918640988 3.409273586 ZT8-11 6.50860776325 5.4514375715000005 7.565777955 ZT12-15 10.5502447535 8.847098032 12.253391475 ZT16-19 9.2864509805 9.166171772 9.406730189000001 ZT20-23 10.92367569325 10.2390754065 11.60827598