condition mean min max ZT0-3 0.4589059095 0.158648318 0.759163501 ZT4-7 2.3293261135 1.5857883335 3.0728638935 ZT8-11 4.02582723025 3.099520558 4.9521339025 ZT12-15 9.59906252475 8.294940125 10.9031849245 ZT16-19 8.5817828435 8.536018007 8.62754768 ZT20-23 8.88140384075 8.295532477999998 9.467275203500002