condition mean min max ZT0-3 37.37975 37.37975 37.37975 ZT4-7 11.456299999999999 11.456299999999999 11.456299999999999 ZT8-11 1.907805 1.907805 1.907805 ZT12-15 1.8004850000000001 1.8004850000000001 1.8004850000000001 ZT16-19 21.988799999999998 21.988799999999998 21.988799999999998 ZT20-23 32.64425 32.64425 32.64425