condition mean min max ZT0-3 11.757774 11.757774 11.757774 ZT4-7 12.0837955 12.0837955 12.0837955 ZT8-11 10.2824695 10.2824695 10.2824695 ZT12-15 11.345660500000001 11.345660500000001 11.345660500000001 ZT16-19 11.057467500000001 11.057467500000001 11.057467500000001 ZT20-23 10.196192 10.196192 10.196192