condition mean min max ZT0-3 0.33555536075 0.286518862 0.38459185949999997 ZT4-7 1.1069857762500002 0.786365142 1.4276064105000001 ZT8-11 1.84168031775 1.7265393995 1.9568212360000001 ZT12-15 4.37603225425 1.9211000775000002 6.830964431 ZT16-19 8.87362055325 7.482701946499999 10.26453916 ZT20-23 13.548053355 11.838747705 15.257359005000001