Study of child bipolar disorders. Psychiatric researchers at the University of Pittsburgh Medical Center have developed a new test for measuring manic symptoms in pediatric bipolar patients. (Journal of Child and Adolescent Psychopharmacology, Dec., 2003.) The new test is called the Kidaie Schedule for Affective Disorders and Schizophrenia-Mania Rating Scale (KSADS-MRS). The new test was compared with the standard test, the Clinical Global Impressions— Bipolar Scale (CGI-BP). Both tests were administered to a sample of 18 pediatric patients before and after they were treated for manic symptoms. The changes in the test scores are recorded in the table on p. 544.
Patient | Change in KSADS-MRS (%) | Improvement in CGI-BP |
1 | 80 | 6 |
2 | 65 | 5 |
3 | 20 | 4 |
4 | −15 | 4 |
5 | −50 | 4 |
6 | 20 | 3 |
7 | −30 | 3 |
8 | −70 | 3 |
9 | −10 | 2 |
10 | −25 | 2 |
11 | −35 | 2 |
12 | −65 | 2 |
13 | −65 | 2 |
14 | −70 | 2 |
15 | −80 | 2 |
16 | −90 | 2 |
17 | −95 | 2 |
18 | −90 | 1 |
Source: Axelson. D. ct al. “A preliminary study of the Kiddie Schedule for Affective Disorders and Schizophrenia for School-Age Children Mania Rating Scale for children and adolescents,” Journal of Child and Adolescent Psychopharmacology, Vol. 13. No. 4, Dec. 2003 (adapted from Figure 2).
a. The researchers used Spearman’s statistic to measure the correlation between the changes in the two test scores. Compute the value of rs.
b. Is there sufficient evidence (at α = .05) of positive rank correlation between the two test score changes in the population of all pediatric patients with manic symptoms?
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