condition mean min max ZT0-3 11.331452963250001 8.0870917265 14.5758142 ZT4-7 1.746306908 1.5578825935 1.9347312225 ZT8-11 2.659486319 1.93932166 3.379650978 ZT12-15 6.6822914635 4.916351941 8.448230986 ZT16-19 8.8684591165 8.501703061499999 9.235215171500002 ZT20-23 9.29059716625 9.071351134 9.5098431985