Sentence examples for variables were ascertained from inspiring English sources

All variables were ascertained by self-report on a questionnaire posted to participants and returned in a reply-paid envelope.

Demographic variables were ascertained by questionnaire.

These variables were ascertained from the patients' medical charts.

All variables were ascertained at the start date.

There were also some differences in how variables were ascertained.

Relationships between PAR and other variables were ascertained using simple linear regression.

Diabetes status, as well as all predictor variables, was ascertained using a self-report method [ 26].

Co-linearity of all variables was ascertained and for variables that were highly co-linear, the variable with the strongest bivariate association was included in the final regression model.

The log-linear relationship between the hazard rate and the quantitative independent variables was ascertained by categorizing the quantitative variables in similar range groups to check if the coefficients for these categories followed a linear pattern [ 35].

The significance of the estimated correlation factors between measured and predicted y-variables was ascertained by using the Pearson correlation test (two-tailed).

Consistent with previous studies, 9, 10 self-reported suicidal ideation as a dependent variable was ascertained by asking, "Have you ever thought of killing yourself during the past 12 months?" with a choice of yes or no for an answer.