condition mean min max ZT0-3 9.198844999999999 7.910539999999999 10.48715 ZT4-7 6.76173 6.76173 6.76173 ZT8-11 8.5243 8.5243 8.5243 ZT12-15 0 0 0 ZT16-19 5.2782 5.2782 5.2782 ZT20-23 7.166175 7.166175 7.166175