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Table 6 ORs of residence type variables in multilevel models

From: Urban–rural disparity in the relationship between ambient air pollution and preterm birth

Model

Type

OR (95% CI)

Hubei

East

Middle

West

1

County town

0.79 (0.70–0.89)*

0.74 (0.63–0.87)*

0.76 (0.60–0.95)*

0.88 (0.66–1.16)

Suburb

0.80 (0.73–0.89)*

0.79 (0.71–0.88)*

0.86 (0.68–1.08)

0.97 (0.58–1.62)

General town

0.73 (0.68–0.78)*

0.72 (0.66–0.78)*

0.69 (0.61–0.78)*

0.81 (0.66–0.99)*

Countryside

0.87 (0.79–0.96)*

0.79 (0.68–0.92)*

0.75 (0.59–0.94)*

0.96 (0.78–1.18)

3

County town

0.82 (0.72–0.93)*

0.76 (0.64–0.91)*

0.99 (0.77–1.27)

0.74 (0.52–1.07)

Suburb

0.85 (0.76–0.96)*

0.88 (0.75–1.03)

0.80 (0.64–1.01)

0.99 (0.47–2.10)

General town

0.78 (0.69–0.87)*

0.82 (0.68–0.99)*

0.74 (0.59–0.94)*

0.80 (0.45–1.44)

Countryside

0.91 (0.78–1.05)

0.91 (0.73–1.13)

0.77 (0.56–1.06)

0.97 (0.53–1.78)

5

County town

0.81 (0.71–0.92)*

0.82 (0.68–0.99)*

1.01 (0.78–1.30)

0.69 (0.47–1.00)

Suburb

0.86 (0.76–0.96)*

0.84 (0.71–0.98)*

0.82 (0.64–1.04)

1.15 (0.53–2.48)

General town

0.78 (0.69–0.88)*

0.79 (0.65–0.96)*

0.75 (0.59–0.94)*

0.96 (0.52–1.79)

Countryside

0.91 (0.78–1.06)

0.87 (0.70–1.09)

0.77 (0.56–1.06)

1.14 (0.61–2.13)

  1. OR, odds ratio; CI, confidence interval
  2. Significant level: “*” p ≤ 0.05