condition mean min max ZT0-3 0.022529 0.022529 0.022529 ZT4-7 0.00873165 0.00873165 0.00873165 ZT8-11 0.0190972 0.0190972 0.0190972 ZT12-15 0.06948004999999999 0.06948004999999999 0.06948004999999999 ZT16-19 0.04588455 0.04588455 0.04588455 ZT20-23 0.03031015 0.03031015 0.03031015