Torre et al. (A-30) conducted a study to determine serum levels of nitrite in pediatric patients with human immunodeficiency virus type 1 (HIV-1) infection. Subjects included 10 healthy control children (six boys and four girls) with a mean age of 9.7 years and a standard deviation of 3.3. The remainder of the subjects were 21 children born to HIV-1-infected mothers. Of these, seven (three boys and four girls) were affected by AIDS. They had a mean age of 6 years with a standard deviation of 2.8. The remaining 14 children (seven boys and seven girls) became seronegative for HIV-1 during the first year of life. Their mean age was 3.3 years with a standard deviation of 2.3 years. Among the data collected were the following serum levels of nitrite ð Þ mmol=L :

Controls n ¼ 10 Seronegativized Children n ¼ 14 HIV-1-Positive Patients n ¼ 7 0.301 0.335 0.503 0.167 0.986 0.268 0.201 0.846 0.335 0.234 1.006 0.946 0.268 2.234 0.846 0.268 1.006 0.268 0.201 0.803 0.268 0.234 0.301 0.268 0.936 0.301 0.268 0.134 0.335 0.167 0.234 Source: Data provided courtesy of Dr. Donato Torre.

cardiac operations. Inclusion criterion for the study was a noncyanotic congenital cardiac defect requiring a relatively simple primary surgical procedure associated with a low postoperative risk.
Among the data collected were the following measurements on interleukin-6 (IL-6) and C-reactive protein (CRP) obtained 4 and 24 hours postoperatively, respectively:
IL-6 CRP IL-6 CRP IL-6 CRP 122 32 467 53 215 50 203 39 421 29 415 41 458 63 421 44 66 12 78 7 227 24 58 14 239 62 265 31 213 9 165 22 97 12 Source: Data provided courtesy of Dr. Marie-Christine Seghaye.
Exercises for Use with Large Data Sets Available on the Following Website:
www.wiley.com/college/daniel