Stratified sampling is used to select a sample that is representative of different groups. If the groups are of different sizes, the number of items selected from each group will be proportional to ...

Introduction Food insecurity is increasing in the UK, impacting choice and diet quality. The current means-tested free school meals (FSM) policy was put in place to address dietary inequalities and ...

To measure the species richness on the school field in areas in which the grass is regularly and irregularly cut.

Objective This study examines whether there is an independent association between mental difficulties in adolescence and educational attainment at age 16. Design Longitudinal study. Setting Nationally ...

In the UK, in 2021, 13.3% of people aged 18 years and over smoked cigarettes, which equates to around 6.6 million people in the population; this is the lowest proportion of current smokers since ...

Cookies are small files stored on your device when you visit a website. We use some essential cookies to make this website work. We would like to set additional cookies to remember your settings and ...

A primary goal of polygenic scores, which aggregate the effects of thousands of trait-associated DNA variants discovered in genome-wide association studies (GWASs), is to estimate individual-specific ...

Learning a second language is crucially important in an increasingly global society, yet surprisingly little is known about why individuals differ so substantially in second language (SL) achievement.