condition mean min max ZT0-3 0.680773 0.5307425 0.875698 ZT4-7 0.621388 0.621388 0.621388 ZT8-11 0.49055 0.49055 0.49055 ZT12-15 1.4903974999999998 1.446305 1.53449 ZT16-19 1.210046 1.210046 1.210046 ZT20-23 1.1242095 1.1242095 1.1242095