Statistical analysis
REGRESSION, ANEUPLOIDY
We determined that a 15% improvement in informed choice in the intervention group was clinically significant based on a similarly designed study, on a background rate of informed choice in the control group of 70%.A Chi‐Square test was used to analyse the test uptake between the intervention and control groups. Robust Poisson regression models were used to assess the rates of informed choice, good knowledge, and value‐consistent behaviour between the intervention and control groups. Subgroup analyses were also performed for the primary outcome of informed choice. The subgroups were age, education level, religion and whether women had aneuploidy screening in their previous pregnancies. A robust Poisson regression model was also used to evaluate the proportion of women who had significant decisional conflict (scores above 37.5) between those who made informed and uninformed choices. Comparisons of the proportion of women who had significant decisional conflict between the intervention and control groups were also carried out before and after adjusting for informed choice using robust Poisson regression. Median regression was used to evaluate whether there was a significant difference in the decisional conflict score between the intervention and control groups. A 2‐sample 