EPI analysis suggests girls' performance has been "declining in absolute terms" since the Covid pandemic, and is linked to "worrying trends around girls' wellbeing" such as worsening mental health, a lack of sleep and social media use.
EPI points to NHS data from 2023, which suggests a higher percentage of girls and women aged between 17 and 19 in England had a "probable" mental health disorder, compared to boys and men.
"You can draw a reasonable hypothesis, which suggests that if girls aren't getting enough sleep, if they're experiencing that their anxiety or even things like eating disorders, that is likely to affect their attendance, how well they're able to concentrate in school and how well they're able to concentrate and perform on exam day," said Ms Perera.
"If their attainment continues to decline and that follows through to A-levels and participation in university, then that could have an effect on both labour market participation and pay disparity as well, or pay equality."
The proportion of pupils who are persistently absent from school in England (missing 10% or more) has grown for both boys and girls since the pandemic - but there's been a greater rise among girls.
Girls are now more likely to be persistently absent. According to DfE figures 21.9% of girls were persistently absent from secondary schools last year, compared to 20.3% of boys.