Table 2 Cox hazard ratios (HR) and 99% confidence intervals (CI) for the outcomes (columns) (i) any psychiatric disorder (ICD-10 F diagnoses), and (ii) any psychotropic medication (ATC N05 and N06) until 2014, in relation to A) maternal purchase of antibiotic drug within 3 months before pregnancy, during pregnancy, and within 3 month after pregnancy, and B) maternal infection and/or purchase of antibiotic drug at least during pregnancy.

From: Early exposure to antibiotic drugs and risk for psychiatric disorders: a population-based study

Exposures and time period (proportion of births)

Any F diagnosis

Any psychotropic medication

HR

99% CI

HR

99% CI

A) Any antibiotic drug (ATC J01)

 Only within 3 months before pregnancy (3 mB)

 No (92.5%)

1.00

 

1.00

 

 Yes (7.5%)

1.07

1.03–1.10

1.06

1.01–1.10

 Only during pregnancy (P)

 No (84.6%)

1.00

 

1.00

 

 Yes (15.4%)

1.16

1.14–1.18

1.16

1.13–1.19

 Only within 3 months after pregnancy (3 mA)

 No (86.1%)

1.00

 

1.00

 

 Yes (13.9%)

1.02

1.00–1.09

1.03

1.00–1.06

 At least during pregnancy

 No (74.3%)

1.00

 

1.00

 

 Yes (25.7%)

1.16

1.14–1.18

1.16

1.13–1.19

B) Infectiona and/or any antibiotic drug in the same model

 At least during pregnancy

 No (74.3%)

1.00

 

1.00

 

 Infection (2.3%)

1.21

1.15–1.28

1.28

1.18–1.38

 Any antibiotic drug (ATC J01) (25.7%)

1.15

1.13–1.17

1.16

1.13–1.19

  1. aInfections considered included: ICD-10 A00-A99, B00-B99, J00-J22, K35 and L00-L08 and O23
  2. ‘No’ were all those not in the corresponding ‘Yes’ category, irrespectively of exposure in another period or not
  3. Adjusted for the variables maternal age, parity, maternal smoking during pregnancy [yes/no], mother unmarried [yes/no], mother born elsewhere than Finland [yes/no], cesarean section [yes/no], mother’s inpatient care due to mental health disorders [yes/no], mother’s purchase of psychotropic drugs (N05 or N06) during pregnancy [yes/no], mother’s diagnoses related to systemic inflammatory disorders [yes/no], multiple birth [yes/no], offspring sex, perinatal health problems (birth weight < 2500 grams, gestational age < 37 weeks or small for gestational age according to Finnish sex-specific standards) [yes/no]