condition mean min max ZT0-3 11.158819 11.158819 11.158819 ZT4-7 9.481743999999999 9.481743999999999 9.481743999999999 ZT8-11 11.1859725 11.1859725 11.1859725 ZT12-15 12.459921999999999 12.459921999999999 12.459921999999999 ZT16-19 11.053730999999999 11.053730999999999 11.053730999999999 ZT20-23 12.344472 12.344472 12.344472