Table 2.

Multivariable model with odds ratios for acute respiratory infection risk factors.

Risk Factor	Odds Ratio (95% Confidence Interval), p-value
25OHD (<30 ng/mL versus ≥30 ng/mL)	1.58 (1.07–2.33), p = 0.023
Low ambient UVB radiation (1 November–30 April)	2.19 (1.69–2.85), p < 0.001
Poverty-to-income ratio (≤FPL versus >FPL)	1.47 (1.10–1.96), p = 0.009
Active smoking	1.39 (1.01–1.91), p = 0.046
Chronic obstructive pulmonary disease	1.94 (1.39–2.72), p < 0.001
Congestive heart failure	1.85 (1.15–2.97), p = 0.012

25OHD = 25-hydroxyvitamin D; UVB = ultraviolet B radiation; FPL = Federal poverty limit.