Table 3.

Univariate Comparison of Demographic and Clinical Characteristics Among Self-Referred and Randomly Selected Cases Compared to 155 Randomly Selected Controls During an Outbreak of Chlamydia pneumoniae Respiratory Illness in a Federal Correctional Facility

Characteristic	Controls (n = 155) No. (%)	Self-Referred Cases (n = 33)			Randomly Selected Cases (n = 19)
		No. (%)	OR (95% CI)	P Value	No. (%)	RR (95% CI)	P Value
Age >55 ya	8 (5.2)	4 (12.5)	2.6 (.7–9.2)	.14	3 (15.8)	2.7 (.9–8.0)	.065
Racea
White	39 (25.5)	15 (55.6)	23.8 (3.0–187.7)	<.01	9 (47.4)	2.5 (.9–7.0)	.079
African-American	44 (28.8)	9 (33.3)	12.7 (1.5–103.7)	.02	4 (21.1)	1.1 (.3–3.9)	.864
Latino-Hispanic	62 (40.5)	1 (3.7)	Referent	…	5 (26.6)	Referent	…
Otherb	8 (5.2)	2 (7.4)	15.5 (1.3–190.9)	.03	1 (5.3)	1.5 (.2–11.3)	.701
No education beyond high school diploma/GEDa	109 (73.6)	15 (65.2)	0.7 (.3–1.7)	.40	10 (55.6)	0.5 (.2–1.2)	.110
Smoker prior to incarcerationa	106 (68.8)	17 (56.7)	0.6 (.3–1.3)	.20	9 (47.4)	0.5 (.2–1.1)	.066
History of asthmaa	19 (12.3)	3 (13.0)	1.1 (.3–3.9)	.92	5 (26.3)	2.2 (.9–5.6)	.092
Unit Y residence compared to unit X	69 (44.5)	23 (69.7)	2.9 (1.3–6.4)	.01	8 (42.1)	0.9 (.4–2.2)	.842
Floor within unit Y
Floor 1	12 (17.4)	1 (4.3)	0.2 (.0–1.3)	.08	0	NA	NA
Floor 2	26 (37.7)	5 (21.7)	0.4 (.1–1.1)	.07	5 (62.5)	1.8 (.5, 7.0)	.3798
Floor 3	31 (44.9)	17 (74.0)	Referent	…	3 (37.5)	Referent	…

Abbreviations: CI, confidence interval; GED, graduate equivalent degree; NA, not applicable; OR, odds ratio; RR, relative risk.

^aCases with missing data were excluded from these figures.

^bIncludes American Indian, Alaska Native, Asian, and Pacific Islander.