Statistical analysis
Data was cleaned using Microsoft Excel and further analysed in IBM SPSS
26. Invalid or missing answers were corrected or deleted by evaluating
women’s comments or subsequent responses throughout the evaluation. If
contradictory information was provided in the evaluation form, e-mail
correspondence was checked in the WoW database for the original answer.
Descriptive statistical analysis was performed on demographic
information and main outcomes. For questions with multiple answers, new
categories were created, and variables were re-coded into binary
variables in accordance with previous
studies(11,
16, 19,
21, 22). 7
age categories were created; <20, 20-24, 25-29, 30-34, 35-39,
40-44, ≥45 based on previous literature and for the purposes of
summarising the data, but age was included as a continuous variable in
logistic regression analysis(21). Evaluations from
Ireland and Northern Ireland were grouped, in accordance with previous
research using WoW data(21). A binary logistic
regression analysis was performed to test associations further. Four
regressions were run for the total sample and year, adjusted for age.
The year 2009 was set as the reference category.