Case-Control Study of Congenital Anomalies: Study Methods and Nonresponse Bias Assessment.

ABSTRACT:

Background

To describe the methods of a congenital anomalies case-control study conducted in New Zealand, discuss the encountered methodological difficulties, and evaluate the potential for nonresponse bias.

Methods

The potential cases (n = 2710) were New Zealand live births in 2007-2009 randomly selected from the New Zealand Congenital Anomalies Registry. The potential controls (n = 2989) included live births identified from the Maternity and Newborn Information System, frequency matched to cases by the child's year of birth and sex. Mothers were invited to complete an interview covering demographic, lifestyle, and environmental factors. Response probabilities for case and control mothers were evaluated in relation to maternal age, deprivation, occupation, and ethnicity, av

SUBMITTER: Eng A 

PROVIDER: S-EPMC11841482 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature