condition mean min max ZT0-3 7.716008514 6.544517829 8.887499199 ZT4-7 8.171509707166667 6.775967505333333 9.567051909 ZT8-11 11.671410579500002 11.246446622 12.096374537 ZT12-15 10.521630346666667 9.961427275333333 11.081833418 ZT16-19 12.629648425 11.495986610000001 13.76331024 ZT20-23 9.4340104775 8.563597958 10.304422997