condition mean min max ZT0-3 11.8386 11.8386 11.8386 ZT4-7 10.160725 10.160725 10.160725 ZT8-11 9.194005 9.194005 9.194005 ZT12-15 10.82165 10.82165 10.82165 ZT16-19 12.584 12.584 12.584 ZT20-23 11.639 11.639 11.639