condition mean min max ZT0-3 0.78403325 0.7162775 0.851789 ZT4-7 0.45796485 0.45796485 0.45796485 ZT8-11 6.729229999999999 6.729229999999999 6.729229999999999 ZT12-15 0 0 0 ZT16-19 13.2689 13.2689 13.2689 ZT20-23 6.772665 6.772665 6.772665