condition mean min max ZT0-3 0.493393 0.493393 0.493393 ZT4-7 3.9123399999999995 3.9123399999999995 3.9123399999999995 ZT8-11 1.70949 1.70949 1.70949 ZT12-15 0.817912 0.817912 0.817912 ZT16-19 0.65027 0.65027 0.65027 ZT20-23 0.4138195 0.4138195 0.4138195