condition mean min max ZT0-3 2.26886216225 1.7494367419999999 2.7882875825 ZT4-7 4.00948489975 3.5117149325 4.507254867 ZT8-11 3.28391085225 3.1878683965 3.379953308 ZT12-15 3.0551846764999997 2.523066494 3.587302859 ZT16-19 3.5515908827500002 2.6607492105 4.442432555 ZT20-23 6.4481018635 6.059129335 6.837074392