Table 1 Descriptive statistics of study participants.

	All		Females		Males
	N		N		N
	Total sample
Total sample (%)	105623	100%	61807	58.5%	43816	41.5%
Age at start follow up in NPR, mean (SD)	33.9	5.3 SD	33.1	5.0 SD	35.1	5.5 SD
	Total depression sample^a
Any depression	32829	31.1%	23759	38.4%	9070	20.7%
Depression in primary care	23212	22.0%	16674	27.0%	6538	14.9%
MDD in specialist health care	9617	9.1%	7085	11.5%	2532	5.8%
	Level of symptom severity^b
Mild MDD	2373	2.2%	1794	2.9%	579	1.3%
Moderate MDD	5306	5.0%	3908	6.3%	1398	3.2%
Severe MDD	1193	1.1%	822	1.3%	371	0.8%
	Level of health care use^c
Depression in primary care	23212	22.0%	16674	27.0%	6538	14.9%
MDD in outpatient care	8035	7.6%	6022	9.7%	2013	4.6%
MDD in inpatient care	1582	1.5%	1063	1.7%	519	1.2%

MDD major depressive disorder, SD standard deviation, NPR National Patient Registry, CPHR Norwegian Control and Payment of Health Reimbursements Database.
^aAny Depression- At least one registration of ICPC-2-code P03/P76 in the CPHR and/or at least one registration of ICD-10 codes F32/F33 in the NPR.
Depression in primary care- at least one registration of ICPC-code P03 and/or P76 in the CPHR, but no registration of MDD in the NPR.
MDD in specialist health care- At least one registration of ICD-10 codes F32/F33 in the NPR.This included the following subcodes: F32/F32.0/F32.1/ F32.2/F32.3/F32.8, /F32.9/F33/F33.0/F33.1/ /F33.2/F33.3/F33.4/F33.8/F33.9.
^bMild MDD- At least one registration of F32.0/F33.0 but no registration of moderate or severe MDD in the NPR.
Moderate MDD- At least one registration of F32.1/F33.1, but no registration of severe MDD in the NPR.
Severe MDD- At least one registration of F32.2/F32.3/F33.2/F33.3 in the NPR.
^cMDD in outpatient care- at least one registration of ICD-code F32/F33 in the NPR, but no MDD in inpatient care.
MDD in inpatient care- at least one registration of ICD-code F32/F33 with inpatient contact F32/F33 in the NPR.

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