condition mean min max ZT0-3 9.465871 9.465871 9.465871 ZT4-7 11.795197 11.795197 11.795197 ZT8-11 9.2878455 9.2878455 9.2878455 ZT12-15 9.1037475 9.1037475 9.1037475 ZT16-19 10.761505 10.761505 10.761505 ZT20-23 11.2987125 11.2987125 11.2987125