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Table 3 Conviction status of the father and odds ratios (ORs) of preterm birth and mean differences of gestational age in days (βs) in population (N = 1,046,986*) and sibling comparison analyses (N = 14,229 for outcome of gestational age, N = 1528 for outcome of preterm birth)

From: Paternal violent criminality and preterm birth: a Swedish national cohort study

 

Preterm birth

Gestational age

%

(n/N)

OR

(95%CI)

β

(95%CI)

 

Population analysis

    

No criminal conviction

4.5

(41,794/931,630)

1

 

0

 

1–2 violent crime convictions

5.3

(4314/81,581)

1.08

(1.04, 1.12)

−0.29

(−0.40, − 0.18)

3+ violent crime convictions

6.3

(2136/33,775)

1.23

(1.17, 1.29)

−0.79

(− 0.96, − 0.62)

 

Sibling comparison

    

No criminal conviction

37.9

(290/765)

1

 

0

 

1–2 violent crime convictions

38.1

(180/473)

0.93

(0.71, 1.21)

0.10

(−0.36, 0.56)

3+ violent crime convictions

45.9

(133/290)

1.27

(0.91, 1.78)

−0.91

(−1.51, − 0.31)

  1. Note:
  2. Bolded figures are significant at p < 0.05
  3. Population analysis adjusted for year of birth, paternal age, maternal age, parity, and paternal education
  4. Sibling comparisons were adjusted for variables in population analysis and also for quintiles of household income in the calendar year before childbirth, maternal early pregnancy BMI, and smoking status
  5. *Excluded 431,717 infants of non-violent fathers from the total study population