Table 2.

Univariate Analysis of Characteristics Associated With Invasive Pneumococcal Disease, 169 Case-patients and 280 Control Subjects, 1994–1996

Characteristic2 to 11 Mo12 to 23 Mo24 to 59 Mo
Cases
(n = 54)
Controls
(n = 73)
ORs
(95% CI)
Cases
(n = 74)
Controls
(n = 117)
ORs
(95% CI)
Cases
(n = 41)
Controls
(n = 90)
ORs
(95% CI)
Day care attendance in the last 3 months48%21%3.20 (1.45, 7.06)55%28%3.08 (1.67, 5.70)54%36%2.43 (1.09, 5.42)
Ear infection in the last 3 months49%27%2.21 (1.03, 4.75)48%30%2.16 (1.17, 4.01)38%15%2.66 (1.08, 6.57)
At least one recent course of antibiotics34%11%3.42 (1.25, 9.39)30%13%3.10 (1.39, 6.93)64%30%3.62 (1.09, 12.10)
Black race44%27%1.93 (0.90, 4.13)36%32%1.23 (0.66, 2.28)51%29%2.73 (1.22, 6.10)
Current breastfeeding7%32%0.21 (0.07, 0.68)5%6%0.75 (0.21, 2.72)1%2%1.18 (0.07, 2.95)
Household income <$30 000/y69%53%1.93 (0.85, 4.38)58%52%1.25 (0.66, 2.38)72%60%1.75 (0.72, 4.26)
Crowding*63%48%1.45 (0.89, 2.37)59%55%1.13 (0.76, 1.68)68%51%1.71 (0.99, 2.95)
Male sex69%55%1.63 (0.76, 3.47)61%56%1.22 (0.67, 2.24)56%51%1.30 (0.59, 2.83)
Asthma15%10%1.27 (0.42, 3.88)8%10%0.93 (0.32, 2.65)7%14%0.45 (0.12, 1.75)