condition mean min max ZT0-3 13.92325 13.71585 14.13065 ZT4-7 11.660035 11.660035 11.660035 ZT8-11 34.049949999999995 34.049949999999995 34.049949999999995 ZT12-15 0 0 0 ZT16-19 23.33835 23.33835 23.33835 ZT20-23 18.519849999999998 18.519849999999998 18.519849999999998