condition mean min max ZT0-3 13.655135 13.655135 13.655135 ZT4-7 21.926278 21.926278 21.926278 ZT8-11 14.8299465 14.8299465 14.8299465 ZT12-15 13.656138 13.656138 13.656138 ZT16-19 15.196525000000001 15.196525000000001 15.196525000000001 ZT20-23 13.868563 13.868563 13.868563