condition mean min max ZT0-3 7.9113125 6.71799 9.104635 ZT4-7 6.119495 6.119495 6.119495 ZT8-11 6.52323 6.52323 6.52323 ZT12-15 0 0 0 ZT16-19 10.31185 10.31185 10.31185 ZT20-23 6.946835 6.946835 6.946835