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Table 6 Crude and adjusted odds ratios (OR) with 95% confidence interval (95% CI) for psychiatric disorders at six and 11 years among singleton pregnancies (37+ weeks of gestational age = reference category), Pelotas, Brazil

From: Gestational age at birth and behavioral problems from four to 11 years of age: birth cohort study

Gestational age (completed weeks)

Models

6 years

11 years

Psychiatric disorders OR (95% CI)

Internalizing disorders OR (95% CI)

Externalizing disorders OR (95% CI)

Psychiatric disorders OR (95% CI)

Internalizing disorders OR (95% CI)

Externalizing disorders OR (95% CI)

 

Model 1a

p = 0.149

p = 0.153

p = 0.777

p = 0.027

p = 0.554

p = 0.496

<34

 

0.4 (0.2; 1.3)

0.4 (0.1; 1.3)

1.1 (0.3; 3.6)

1.3 (0.7; 2.6)

0.6 (0.1; 2.4)

1.0 (0.4; 2.9)

34–36

 

1.2 (0.9; 1.6)

1.2 (0.8; 1.7)

1.2 (0.7; 2, 1)

1.6 (1.1; 2.1)

1.2 (0.7; 2.0)

1.3 (0.8; 2.1)

37+

 

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

 

Model 2b

p = 0.208

p = 0.237

p = 0.873

p = 0.048

p = 0.701

p = 0.634

<34

 

0.5 (0.2; 1.2)

0.4 (0.1; 1.3)

1.1 (0.3; 3.3)

1.3 (0.7; 2.6)

0.6 (0.1; 25)

1.0 (0.3; 2.7)

34–36

 

1.2 (0.8; 1.6)

1.2 (0..8; 1.7)

1.2 (0.7; 2.0)

1.5 (1.1; 2.1)

1.1 (0.7; 1.9)

1.3 (0.8; 2.0)

37+

 

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

 

Model 3c

p = 0.209

p = 0.235

p = 0.905

p = 0.043

p = 0.663

p = 0.601

<34

 

0.5 (0.2; 1.2)

0.4 (0.1; 1.3)

1.0 (0.3; 3.4)

1.3 (0.7; 2.6)

0.6 (0.1; 2.5)

1.0 (0.3; 2.7)

34–36

 

1.1 (0.8; 1.6)

1.2 (0.8; 1.7)

1.1 (0.6; 2.0)

1.5 (1.1; 2.1)

1.1 (0.7; 1.9)

1.3 (0.8; 2.0)

37+

 

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

 

Model 4d

p = 0.173

p = 0.240

p = 0.835

p = 0.073

p = 0.543

p = 0.578

<34

 

0.5 (0.2; 1.3)

0.6 (0.2; 2.0)

1.0 (0.3; 3.7)

1.4 (0.6; 3.2)

1.4 (0.3; 6.9)

0.9 (0.3; 3.1)

34–36

 

1.2 (0.8; 1.7)

1.3 (0.9; 1.9)

1.2 (0.7; 2.2)

1.5 (1.1; 2.2)

1.4 (0.8; 2.4)

1.3 (0.8; 2.1)

37+

 

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

 

Model 5e

p = 0.168

p = 0.175

p = 0.702

p = 0.125

p = 0.607

p = 0.482

<34

 

0.6 (0.2; 1.7)

0.8 (0.2; 2.8)

1.1 (0.3; 4.3)

1.4 (0.6; 3.2)

1.6 (0.3; 7.6)

1.0 (0.3; 3.2)

34–36

 

1.3 (0.9; 1.9)

1.4 (1.0; 2.1)

1.3 (0.7; 2.4)

1.5 (1.0; 2.1)

1.3 (0.7; 2.4)

1.4 (0.8; 2.3)

37+

 

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

1.0 (reference)

  1. aModel 1 = crude analysis
  2. bModel 2: Model 1 + family income, marital status, maternal skin color and maternal schooling
  3. cModel 3 = Model 2 + maternal age, parity and smoking during pregnancy
  4. dModel 4 = Model 3 + type of delivery, child’s sex, low birth weight, Apgar at 1st and 5th minute of life, intensive care hospitalization at birth
  5. eModel 5 = Model 4 + hospitalization in the 1st year of life, breastfeeding, and maternal depression at the fourth-year follow-up (for age 6 years) and at the sixth-year follow-up (for age 11 years)
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BMC Pediatrics

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