Experimental Design
depression
This experimental study aimed to test the impact on health literacy and empowerment of a DTCA video for a prescription medication used to treat depression. The experimental factor in the main study was manipulated and participants were randomized into three different conditions (DTCA video vs text vs DTCA video+text). This represents an incomplete full factorial design (ie, a 2 [absence/presence]×2 [video/information sheet] design) with the no video/no information sheet group missing. The incomplete structure was chosen as the missing group would represent people not exposed to any kind of information (neither via reading material nor video), and such people hardly exist. This choice was based on the almost complete absence of such a design in relevant studies [