condition mean min max ZT0-3 0.44210900000000003 0.19025599999999998 0.9447615 ZT4-7 1.06044 1.06044 1.06044 ZT8-11 1.516985 1.516985 1.516985 ZT12-15 3.9563175 3.56104 4.351595 ZT16-19 1.50862 1.50862 1.50862 ZT20-23 0.4987385 0.4987385 0.4987385