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Table 4 Associations between use of folic acid, iron and multivitamin supplements and the interaction between the number of prenatal visits and formal education level

From: Nutritional knowledge as a determinant of vitamin and mineral supplementation during pregnancy

  

Folic acid

Iron

Vitamins

  

OR (95% CI)

OR#(95% CI)

OR (95% CI)

OR#(95% CI)

OR (95% CI)

OR#(95% CI)

Education*Prenatal care interaction

PC1*E1

110.63 (14.94-818.97)

63.86 (8.47-481.41)

10.35 (4.60-23.27)

7.95 (3.36-18.83)

18.20 (8.46-39.16)

11.25 (4.96-25.49)

PC1*E2

51.78 (6.83-392.29)

32.281 (4.97-294.63)

7.45 (2.66-20.88)

6.20 (2.17-17.73)

15.33 (5.64-41.68)

11.71 (4.17-32.87)

PC2*E1

13.73 (5.50-34.22)

10.941 (4.30-27.78)

1.62 (0.82-3.19)

1.38 (0.68-2.79)

4.67 (2.28-9.55)

3.65 (1.72-7.71)

PC2*E2

2.96 (1.70-5.15)

2.51 (1.41-4.49)

1.95 (1.13-3.38)

1.73 (1.10-3.03)

2.31 (1.23-4.34)

2.03 (1.05-3.91)

Nutritional knowledge score

Low

1

1

1

1

1

1

 

Medium

6.67 (2.62-17.01)

1.47 (0.74-2.89)

1.80 (0.99-3.27)

1.65 (0.86-3.15)

3.58 (1.88-6.80)

1.14 (0.52-2.50)

 

High

8.30 (2.99-23.4)

7.13 (2.33-21.80)

2.41 (1.14-5.14)

2.37 (1.50-5.65)

3.48 (1.50-8.10)

3.62 (1.38-9.51)

  1. PC1 – prenatal care:≥ 10 visits;PC2 - prenatal care: 4–9 visits; reference category - < 4 visits.
  2. E1 – education: >12 years; E2 – 9–12 years; reference category - ≤ 8 years.
  3. OR#-adjusted for the interaction effect (PC*E).