condition mean min max ZT0-3 0.922412 0.922412 0.922412 ZT4-7 0.8287015 0.8287015 0.8287015 ZT8-11 0.419624 0.419624 0.419624 ZT12-15 0.6011 0.6011 0.6011 ZT16-19 0.8836360000000001 0.8836360000000001 0.8836360000000001 ZT20-23 0.6385645 0.6385645 0.6385645