condition mean min max ZT0-3 2.0023075 1.9648050000000001 2.03981 ZT4-7 1.9558650000000002 1.9558650000000002 1.9558650000000002 ZT8-11 3.955305 3.955305 3.955305 ZT12-15 0 0 0 ZT16-19 4.22461 4.22461 4.22461 ZT20-23 3.02292 3.02292 3.02292