condition mean min max ZT0-3 21.357789 21.357789 21.357789 ZT4-7 25.999897 25.999897 25.999897 ZT8-11 46.540293000000005 46.540293000000005 46.540293000000005 ZT12-15 40.3769935 40.3769935 40.3769935 ZT16-19 30.72171 30.72171 30.72171 ZT20-23 31.681868 31.681868 31.681868