Challenges in reaching patients with severe mental illness for trials in general practice—a convergent mixed methods study based on the SOFIA pilot trial

Table 3 p values from chi-squared tests

	Included patients vs. eligible patients	Included patients vs. register sample	Included patients vs. importance sampling	Register sample vs. importance sampling
Psychiatic diagnosis	0.05	< 0.001^*	1.00	< 0.001^*
Sex	0.14	0.001^*	0.13	< 0.001^*
Age	0.73	0.01^*	0.03^*	< 0.001^*
Contacts to GP 2020	0.34	0.01^*	0.07	< 0.001^*
Substance use disorder	0.85	0.58	0.25	< 0.001^*
N. Somatic comorbidities	0.02^*	< 0.001^*	< 0.001^*	< 0.001^*
Income in 2020	0.02^*	< 0.001^*	0.09	< 0.001^*
Highest attained education 2020	< 0.001^*	< 0.001^*	0.08	< 0.001^*
Working status	0.22	< 0.001^*	0.45	< 0.001^*
Civil status	0.04^*	0.003^*	0.56	< 0.001^*

ISSN: 2055-5784