condition mean min max ZT0-3 1.84695 1.240985 2.452915 ZT4-7 3.40115 3.40115 3.40115 ZT8-11 1.9980099999999998 1.9980099999999998 1.9980099999999998 ZT12-15 0 0 0 ZT16-19 1.7092 1.7092 1.7092 ZT20-23 1.636995 1.636995 1.636995