condition mean min max ZT0-3 37.408500000000004 36.2669 38.5501 ZT4-7 19.11675 19.11675 19.11675 ZT8-11 16.217550000000003 16.217550000000003 16.217550000000003 ZT12-15 0 0 0 ZT16-19 29.27245 29.27245 29.27245 ZT20-23 30.7509 30.7509 30.7509