condition mean min max ZT0-3 16.57105 16.57105 16.57105 ZT4-7 12.1707 12.1707 12.1707 ZT8-11 14.0407 14.0407 14.0407 ZT12-15 13.8421 13.8421 13.8421 ZT16-19 16.0912 16.0912 16.0912 ZT20-23 15.79335 15.79335 15.79335