condition mean min max ZT0-3 1.304415 1.304415 1.304415 ZT4-7 1.2358635 1.2358635 1.2358635 ZT8-11 2.627505 2.627505 2.627505 ZT12-15 2.726875 2.726875 2.726875 ZT16-19 1.78918 1.78918 1.78918 ZT20-23 1.4604050000000002 1.4604050000000002 1.4604050000000002