This resulted in small portions of absent data: history of sexual intercourse, 8%; one night stands, 10%; infidelity, 4%.
Up to two "catch-up" visits were made to schools to obtain data on any pupils who were absent on the day of data collection for their school, but inevitably some pupils will have been absent on both the main and catch-up visits for their school at either baseline or follow-up.
It's what we like to call "Data Puke"; loads of data absent real insight.
Indeed, this gene was absent in a number of data sets.
Eleven students who provided consent did not complete a questionnaire because they were absent on the day of data collection.
In the control group, teachers of three classes withdrew consent, 361 students had no parental permission and 131 were absent on the day of data collection.
Ninety-eight per cent of the students from the selected institutions participated, as 2% were absent on the day of data collection.
Of the 24 non-participants, 4 did not return the parental consent forms, 17 were absent on the day of data collection and 3 were removed from the data set due to incomplete data.
Out of 2,096 students selected, 118 (5.7%) were absent on the day of data collection, 23 (1.1%) were not permitted to participate by their parents or guardians, and 12 (0.6%) were excluded because more than one-third of the questionnaire was not completed.
