Table 1.

Mixed-effects analyses comparing Utøya students’ academic performance before and after the Utøya shootings

	Mean value	95% CI for mean difference	p
Comparing second year HS with first year HS	−5.51	−8.23, −2.79	0.001
Comparing third year HS with first year HS	−3.07	−6.0, −0.15	0.039

HS, high school.