Wiki Page, Math 13 - Perez Sandbox : ANSWER(S): Module 10- Treating Depression Lab Part 2 (discussion 1)

Wiki Page
2026-01-17T21:14:46-08:00

1. Here is the two-way contingency table. (We ignore the Chi-square table until later in the course.)

Contingency table results:
Rows: Treat
Columns: Outcome

| 0 | 1 | Total
0 | 14 | 23 | 37
1 | 27 | 11 | 38
2 | 11 | 23 | 34
Total | 52 | 57 | 109

Chi-Square test:

Statistic | DF | Value | P-value
Chi-square | 2 | 12.959236 | 0.0015

2. Analyze the data using conditional percentages: The percentage of patients that had a recurrence of depression is: 62.16% (23 out of 37) in the Lithium treatment group, 28.95% (11 out of 38) in the Imipramine treatment group, and 67.65% (23 out of 34) in the Placebo group.

3. Draw Conclusions: The results from this experiment show that Imipramine is by far more effective than Lithium in preventing the recurrence of depression. Only 28.95% of patients taking Imipramine had a recurrence of depression, compared to nearly twice that rate in the Lithium group (62.16%). In addition, we can see that there was really no benefit in taking Lithium. Those taking Lithium and those receiving no treatment had similar rates of depression recurrence (about 62% vs. 68%).