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. Author manuscript; available in PMC: 2009 Aug 3.
Published in final edited form as: Pharmacoeconomics. 2008;26(7):603–616. doi: 10.2165/00019053-200826070-00007

Table 4.

Logit Model Results for Probability of Any DTCA Spending in a Given Quarter

Variable Estimate Standard Error P-value
Time to patent expiration −1.21 1.30 0.35
New formulation −3.33 1.33 0.01
Social anxiety (SAD) indication 4.06 1.04 <0.001
Molecule order of entry −1.03 0.33 0.002
Quarter 0.10 0.05 0.04
Intercept 0.71 0.82 0.38