condition mean min max ZT0-3 2.83988 2.7256 2.95416 ZT4-7 1.8153650000000001 1.8153650000000001 1.8153650000000001 ZT8-11 3.9039200000000003 3.9039200000000003 3.9039200000000003 ZT12-15 0 0 0 ZT16-19 3.636265 3.636265 3.636265 ZT20-23 2.11185 2.11185 2.11185