condition mean min max ZT0-3 6.3768613707499995 2.6773713215 10.07635142 ZT4-7 6.09266519325 3.4073734355000003 8.777956951 ZT8-11 34.279693454 22.794320473 45.765066435 ZT12-15 35.72148566 28.559039645 42.883931675 ZT16-19 25.3647123575 25.016301835 25.71312288 ZT20-23 19.880647855 18.443765385 21.317530325