condition mean min max ZT0-3 0.43655333333333335 0.249014 0.53162 ZT4-7 0.244091 0.244091 0.244091 ZT8-11 0.0 0.0 0.0 ZT12-15 0.67997175 0.56849 0.7914535 ZT16-19 1.454114 1.454114 1.454114 ZT20-23 0.8302655000000001 0.8302655000000001 0.8302655000000001