Table 2.

Associations with chest illness after study entry (n=253)^a

Characteristic	Relative Risk	95% CI	P value
Vitamin D categories (ng/ml)
Pneumonia/bronchitis after SCI
Yes and with chest illness in last 3 years	7.62	3.70, 15.71	<0.001
Yes and without chest illness in last 3 years	2.75	1.26, 5.99	0.01
No and with chest illness last 3 years	1.93	0.70, 5.34	0.21
Vitamin D (ng/ml)
<20 (deficient)	1.36	0.74, 2.47	0.32
≥20 – <30 (insufficient)	0.90	0.51, 1.60	0.72
≥ 30 (sufficient)	Ref	Ref	Ref
Vitamin D quartiles (ng/ml)
Pneumonia/bronchitis after SCI
Yes and with chest illness in last 3 years	7.46	3.62, 15.38	<0.001
Yes and without chest illness in last 3 years	2.76	1.27, 5.98	0.01
No and with chest illness last 3 years	1.89	0.68, 5.25	0.22
Vitamin D (ng/ml)
<19.9	1.41	0.78, 2.53	0.25
≥19.9 – ≤24.0	1.11	0.55, 2.25	0.77
>24.0 – ≤29.5	0.76	0.36, 1.61	0.48
>29.5	Ref	Ref	Ref
Vitamin D continuous (ng/ml)
Pneumonia/bronchitis after SCI
Yes and with chest illness in last 3 years	7.57	3.69, 15.53	<0.001
Yes and without chest illness in last 3 years	2.73	1.27, 5.88	0.01
No and with chest illness last 3 years	2.00	0.73, 5.51	0.18
Vitamin D per 20 ng/ml	0.70	0.44, 1.12	0.14

^aAll models age, sex, smoking history, COPD history, and past chest illness adjusted.