A completely randomized double-blind clinical trial was conducted to compare two drugs, ticrynafen (T) and hydrochlorothiazide (H), for effectiveness in treatment of high blood pressure. Each drug was given at either a low or a high dosage level for 6 weeks. The accompanying table shows the results for the drop (baseline minus final value) in systolic blood pressure (mm Hg).22

Prepare an interaction graph (like Figure 11.7.3).

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Ticrynafen (T) Hydrochlorothiazide (H) Low High Low dose dose High dose Mean 139 17.1 No of 5357 patients dose 17.5 58 15.8