condition mean min max ZT0-3 13.7273 13.7273 13.7273 ZT4-7 11.58775 11.58775 11.58775 ZT8-11 12.591899999999999 12.591899999999999 12.591899999999999 ZT12-15 12.7927 12.7927 12.7927 ZT16-19 14.7954 14.7954 14.7954 ZT20-23 13.31265 13.31265 13.31265