TABLE 3.

Phase 3 quality scoring criteria for literature used for the comparison of different killing methods (Section 4) in pigs and poultry.

Score 1 (Lowest quality ranking)	According to data extracted, the publication was identified as either one or a combination of the following: No replication No welfare outcomes Small sample size Mode of killing details insufficient
Score 2 (Medium quality ranking)	According to data extracted, the publication was identified as either one or a combination of the following: Sufficient replication and sample size Welfare outcomes identified Mode of killing detail sufficient
Score 3 (Highest quality ranking)	According to data extracted, the publication was identified as either one or a combination of the following: Provided guidance and conclusions relating to Welfare policy Provided basic information that might be interpreted as being policy relevant Providing fundamental new knowledge that informs killing practices, legislation or policy Identified new or little understood issues of welfare concern in animal killing Provided information or data supporting current practices and legislation Provided new fundamental data and information that increase understanding of animal killing welfare issues