condition mean min max ZT0-3 1.892415 1.3738549999999998 2.410975 ZT4-7 2.7927 2.7927 2.7927 ZT8-11 11.035655 11.035655 11.035655 ZT12-15 0 0 0 ZT16-19 8.363425 8.363425 8.363425 ZT20-23 4.52075 4.52075 4.52075