condition mean min max ZT0-3 193.51019 193.51019 193.51019 ZT4-7 219.782784 219.782784 219.782784 ZT8-11 84.757625 84.757625 84.757625 ZT12-15 198.396475 198.396475 198.396475 ZT16-19 79.057842 79.057842 79.057842 ZT20-23 98.146641 98.146641 98.146641