Information is obtained from a package filling machine, regarding sampling occasions in the form of sampling records. Each sampling record comprises a first time stamp for the sampling occasion, information describing a trigger for the sampling occasion, a number of package samples taken at the sampling occasion, and a second time stamp that specifies when the package samples were taken. Analysis information regarding contaminated package samples is obtained from a package sample analysis system. The sampling records and analysis information are processed to link contaminated package samples with sampling occasions. A table is generated that comprises, for each sampling occasion, the first time stamp, the information that describes a trigger for the sampling occasion, the number of package samples taken at the sampling occasion, the second time stamp and a number of contaminated package samples at the sampling occasion.