Table 3 Pairwise statistical tests to determine (1) if trendline slopes for 2005–2009 Internet DTCA data sources were significantly different and (2) if magnitudes for 2005–2009 Internet DTCA data sources were significantly different after adjusting for effect of time

From: The rise of digital direct-to-consumer advertising?: Comparison of direct-to-consumer advertising expenditure trends from publicly available data sources and global policy implications