http://www.ncbi.nlm.nih.gov/pmc/articles/PMC175811/ in full text. Wrong authors, wrong publication date, wrong country. The exposure group was based on actual use not on prescription use, and it adjusted for gestational age at entry. Here is full text of the 2012 paper in PDF. Neither study can assess whether NSAID exposure before implantation or shortly after may cause a spontaneous abortion before clinical recognition of pregnancy.