condition mean min max ZT0-3 0.03623375 0.019476999999999998 0.0529905 ZT4-7 0.0340161 0.0340161 0.0340161 ZT8-11 0.0 0.0 0.0 ZT12-15 0.037294425 0.0200556 0.05453325 ZT16-19 0.0621154 0.039966999999999996 0.0842638 ZT20-23 0 0 0