condition mean min max ZT0-3 35.8433 35.8433 35.8433 ZT4-7 24.0161 24.0161 24.0161 ZT8-11 27.23635 27.23635 27.23635 ZT12-15 33.02105 33.02105 33.02105 ZT16-19 47.0473 47.0473 47.0473 ZT20-23 46.708 46.708 46.708