condition mean min max ZT0-3 9.913243 9.913243 9.913243 ZT4-7 12.5454245 12.5454245 12.5454245 ZT8-11 11.4898815 11.4898815 11.4898815 ZT12-15 10.090593 10.090593 10.090593 ZT16-19 13.399683 13.399683 13.399683 ZT20-23 11.587145499999998 11.587145499999998 11.587145499999998