condition mean min max ZT0-3 13.38155 13.38155 13.38155 ZT4-7 7.4477150000000005 7.4477150000000005 7.4477150000000005 ZT8-11 14.48245 14.48245 14.48245 ZT12-15 28.41255 28.41255 28.41255 ZT16-19 28.526699999999998 28.526699999999998 28.526699999999998 ZT20-23 20.5926 20.5926 20.5926