Study | Country Study period Study design |
Data source | Exposure definition | Non-exposure definition | Exposition period | Sample size (exposed/unexposed) Or (case / control) |
Remarks | Risk of bias |
---|
Study | Country Study period Study design |
Data source | Case | Control | Exposition | Exposition period | Sample size (exposed/unexposed) Or (case / control) |
Remarks | Risk of bias |
---|---|---|---|---|---|---|---|---|---|
Carter 2008 |
USA 1997 - 2003 case control |
National Birth Defects Prevention Study (NBDPS), USA | Cases with selected birth defects (included live births, stillbirths 20 weeks or longer or greater than 500 g, or elective terminations). | Live births without birth defects that were randomly selected from birth certificates or birth hospitals in the geographic regions monitored by the state surveillance systems. | Structured maternal interviews were conducted mainly by telephone in English or Spanish no later than 24 months after the expected date of delivery (EDD) to obtain data on maternal exposures during pregnancy. | 1st trimester | 12274 / 4774 | ||
Cases and controls were identified by the birth defects surveillance systems in 10 states of USA. Medical records were obtained for all cases and reviewed by clinical geneticists. | |||||||||
Czeizel 2003 |
Hungary 1980 - 1996 case control |
Hungarian Case-Control Surveillance of Congenital Abnormalities (HCCSCA) | Newborn infants (liveborn infants, stillborn and electively terminated fetuses) with congenital abnormalities. Minor anomalies were excluded. | Newborn infants without congenital abnormalities. | Exposure data collected from 3 sources: a post-paid structured questionnaire sent to the parents requesting drugs taken during pregnancy, according to gestational months; maternal prenatal care logbook (in which obstetricians must record all prescribed drugs); nurses visited non-responding families. | 1st trimester | 22843 / 38151 | ||
The Hungarian Congenital Abnormality Registry (HCAR), in which notification by physicians of cases with Congenital anomalies is mandatory (including infant deaths and usual stillborn fetuses). Controls were selected from the National Birth Registry of the Central Statistical Office. |
Risk of bias: : NA; : low; : moderate; : serious; : critical; : unclear;