However, slightly different results are presented from European countries. Beffy et
al., (2010), while correcting for the potential endogeneity of early employment, still found a
negative impact of part-time employment on French undergraduate and postgraduate
students. They found that working part-time significantly reduced the probability of
graduation, even after using an instrumental variables approach to control for the endogeneity
of part-time employment. No impact of part-time employment while at school was found for
Northern Ireland (Mcvicar and Mckee, 2001) subjects. Using a relatively small sample of 428
students, they examined employment during post-compulsory education. However, when
intensive part-time work (more than 15 hours per week) was considered, the effect became
significantly negative. However, the reliability of these results is questionable, due to a
relatively small sample size (428 individuals)