For each of the studies that met the inclusion criteria, the
following information was compiled: the number of samples
measured (number of refrigerators or shipments), the percentage
of samples that registered temperatures that were too
cold, the temperature that was used as the cutoff for defining
“too cold” in each study (freeze-exposure threshold), the
period and frequency of temperature measurement, the type
of measuring equipment used, the country in which the study
was conducted, and the year in which the study was published
or reported. From articles in which both transport and storage
temperature data were collected, information about each
segment was noted separately. Thus, some studies provided
multiple data points.