condition mean min max ZT0-3 1.678925 1.598045 1.759805 ZT4-7 1.141715 1.141715 1.141715 ZT8-11 2.14964 2.14964 2.14964 ZT12-15 0 0 0 ZT16-19 2.80603 2.80603 2.80603 ZT20-23 2.02158 2.02158 2.02158