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Influence of Maternal Prenatal Vitamin D Status on Infant Oral Health

Influence of Maternal Prenatal Vitamin D Status on Infant Oral Health

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Chapter 5 – Multivariate Regressi<strong>on</strong> Results<br />

This chapter reports results from multiple and logistic regressi<strong>on</strong> analyses for key<br />

outcome variables <str<strong>on</strong>g>of</str<strong>on</strong>g> interest in the study, specifically 25(OH)D, enamel hypoplasia, and<br />

early childhood caries (ECC). Since the number <str<strong>on</strong>g>of</str<strong>on</strong>g> maternal-infant dyads taking part in<br />

this prospective cohort was small numerous logistic and multiple regressi<strong>on</strong> analyses<br />

were undertaken to prevent over-fitting <str<strong>on</strong>g>of</str<strong>on</strong>g> the models and avoid potential false<br />

associati<strong>on</strong>s. Descripti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> these models appears in the methods chapter <str<strong>on</strong>g>of</str<strong>on</strong>g> this thesis.<br />

I. Multiple Regressi<strong>on</strong> Analysis for 25(OH)D<br />

Multiple regressi<strong>on</strong> analyses were c<strong>on</strong>ducted for maternal 25(OH)D status. Table 5.1<br />

reports the results from the first model that included serum metabolites <str<strong>on</strong>g>of</str<strong>on</strong>g> calcium,<br />

alkaline phosphatase, and phosphorus that were measured from the maternal blood draw<br />

taken during pregnancy. It was apparent that n<strong>on</strong>e <str<strong>on</strong>g>of</str<strong>on</strong>g> these metabolites were significantly<br />

correlated with 25(OH)D c<strong>on</strong>centrati<strong>on</strong>s in this model. Further, this model <strong>on</strong>ly explained<br />

0.4% <str<strong>on</strong>g>of</str<strong>on</strong>g> the variance.<br />

Table 5.1 – Multiple regressi<strong>on</strong> analysis for 25(OH)D c<strong>on</strong>centrati<strong>on</strong> – Serum metabolites<br />

<str<strong>on</strong>g>of</str<strong>on</strong>g> alkaline phosphatase, calcium, and phosphorus<br />

Variable<br />

Regressi<strong>on</strong> ± 95% C<strong>on</strong>fidence P value<br />

Coefficient<br />

Interval<br />

Intercept 10.61<br />

Alkaline<br />

0.034 0.067 .32<br />

Phosphatase<br />

Calcium 7.94 37.47 .68<br />

Phosphorus 14.44 19.73 .15<br />

Adjusted R 2 = 0.4%<br />

5-1

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