Table 3.

Regression Models for ARI Using Time-Dependent 25(OH)D₃ Values as a Covariate

Models for ARI	aEstimate (Standard Error)	P
Tertile 1: 25(OH)D3 range 0.3–20.3 ng/mL
Time, mo	–0.1274 (0.090)	.16
25(OH)D3, ng/mL	–0.2826 (0.1496)	.062
Time*25(OH)D3	0.0102 (0.0063)	.111
Tertile 2: 25(OH)D3 range 20.3–33.6 ng/mL
Time, mo	–0.2829 (0.1836)	.129
25(OH)D3, ng/mL	–0.1659 (0.1648)	.318
Time*25(OH)D3	0.0105 (0.0067)	.122
Tertile 3: 25(OH)D3 range 33.7–73.5 ng/mL
Time, mo	–0.0428 (0.0602)	.673
25(OH)D3, ng/mL	–0.0464 (0.0602)	.442
Time*25(OH)D3	0.0012 (0.0022)	.584

Abbreviation: ARI, acute respiratory infection.

^aEstimates are from mixed-effects logistic regression models.