condition mean min max ZT0-3 11.8070925 8.722484999999999 14.8917 ZT4-7 0.3831585 0.3831585 0.3831585 ZT8-11 0.0 0.0 0.0 ZT12-15 0 0 0 ZT16-19 0.21853099999999998 0.21853099999999998 0.21853099999999998 ZT20-23 0.1644935 0.1644935 0.1644935