condition mean min max ZT0-3 1.1034408333333332 0.8784055 1.377643 ZT4-7 0.837736 0.837736 0.837736 ZT8-11 1.2255125 1.2255125 1.2255125 ZT12-15 2.8114925 2.711305 2.91168 ZT16-19 0.686145 0.686145 0.686145 ZT20-23 3.030345 3.030345 3.030345