Completeness of scale responses
The highest levels of scale completeness were observed at baseline (AOM-SOS 92%, AOM-FS 99%), and day 7 (AOM-SOS 85%–AOM-FS 88%), with lesser completeness related to missed study visits. The difference between the two scales was due to the option of “don’t know” which we had added to the AOM-SOS for our trial and subsequently handled as missing data. There was no significant difference in missing data between version 3 and 4 of the AOM-SOS, p-value = 0.72. The data collected through the take home diary was only available for 55 of 224 participants, and so was not analysed for this paper.