condition mean min max ZT0-3 3.51208 3.48698 3.53718 ZT4-7 2.87232 2.87232 2.87232 ZT8-11 2.01056 2.01056 2.01056 ZT12-15 0 0 0 ZT16-19 3.9805599999999997 3.9805599999999997 3.9805599999999997 ZT20-23 3.96047 3.96047 3.96047