condition mean min max ZT0-3 9.15078 9.15078 9.15078 ZT4-7 9.9586015 9.9586015 9.9586015 ZT8-11 11.0386755 11.0386755 11.0386755 ZT12-15 11.412493000000001 11.412493000000001 11.412493000000001 ZT16-19 11.832645 11.832645 11.832645 ZT20-23 11.2661265 11.2661265 11.2661265