A nurse researcher is assessing how well patients respond to two different dosing regimens of a new drug approved to treat diabetic neuropathy. Two different dosing regimens are administered, and side effects are monitored. Results are shown in Table 1-2.

What is the independent variable?

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TABLE 1-2 Side Effect Reported Nausea Headache Weight gain Weight loss Lethargy Self-Reported Side Effects of Two Randomized Groups of 100 Individuals Treated for Diabetic Neuropathy Skin rash Low Dosage 8 3 1 0 3 13 High Dosage 21 5 0 6 11 13