Dopesick on Hulu includes a great example of a compressed chart scale. The show is about the opioid crisis and features the Sackler family and Purdue Pharma’s role in convincing doctors that OxyContin is not addictive. To prove the point, Purdue shared this graph, showing that the “time release” capsules don’t cause mood spikes (“fewer peaks and valleys”). The trouble, as business communication students can observe, is the Y axis.

In Episode 6 (around 21 minutes), we hear the explanation: “But see what Purdue did? They dramatically compressed the scale.” On the chart, we see that 30 looks to be the midpoint. They used a logarithmic instead of a linear scale to homogenize or “smooth out” the data. (Here’s a good explanation of logarithmic scales.)

In the show, an FDA official says they instructed Purdue Pharma not to use the chart, but the company did anyway. Of course, I’m not sure what happened, exactly, and I didn’t get the court filings to verify the chart.

The show offers many other examples of the company’s persuasive communications and the tragic effect on people’s lives. For more research about Purdue’s misleading communications, see this LA Times article. Also read a fascinating trove of Purdue emails here.