condition mean min max ZT0-3 5.275567499999999 5.1899049999999995 5.36123 ZT4-7 5.126844999999999 5.126844999999999 5.126844999999999 ZT8-11 7.318849999999999 7.318849999999999 7.318849999999999 ZT12-15 0 0 0 ZT16-19 8.538945 8.538945 8.538945 ZT20-23 5.26339 5.26339 5.26339