condition mean min max ZT0-3 0.523358 0.523358 0.523358 ZT4-7 0.2396465 0.2396465 0.2396465 ZT8-11 1.0117925 1.0117925 1.0117925 ZT12-15 0.7848645 0.7848645 0.7848645 ZT16-19 1.322 1.322 1.322 ZT20-23 0.803461 0.803461 0.803461