condition mean min max ZT0-3 10.3534389125 3.6478162549999995 17.05906157 ZT4-7 2.85964215725 2.4379230080000003 3.2813613065 ZT8-11 2.48785807475 2.4777408775 2.497975272 ZT12-15 3.33390239925 2.703796503 3.9640082955 ZT16-19 3.31618184475 3.0805248455000003 3.5518388439999997 ZT20-23 3.99752609225 3.8879819185 4.107070266