condition mean min max ZT0-3 65.137661 65.137661 65.137661 ZT4-7 49.756687 49.756687 49.756687 ZT8-11 46.9756645 46.9756645 46.9756645 ZT12-15 69.67507950000001 69.67507950000001 69.67507950000001 ZT16-19 92.233673 92.233673 92.233673 ZT20-23 95.37205349999999 95.37205349999999 95.37205349999999