Table 2.

Regression analyses^a for completion of primary vaccination (≥ 2 doses) and booster vaccination (≥ 3 doses) against COVID-19 by sociodemographic and health characteristics among individuals 18–44 y of age^b.

		Have received ≥ 2 doses						Have received ≥ 3 doses
	N	N (%) vaccinated		Unadjusted RR [95% CI]c		Adjustedd RR [95% CI]c		N (%) vaccinated		Unadjusted RR [95% CI]c		Adjustedd RR [95% CI]c
Education levele
<Upper secondary	245597	193360	(79)	1.00	(ref. level)	1.00	(ref. level)	94,102	(38)	1.00	(ref. level)	1.00	(ref. level)
Upper secondary	399667	351489	(88)	1.12	[1.11,1.12]	1.07	[1.07,1.08]	204643	(51)	1.34	[1.33,1.34]	1.23	[1.22,1.24]
University short	408051	380561	(93)	1.19	[1.18,1.19]	1.13	[1.13,1.13]	254394	(62)	1.63	[1.62,1.64]	1.45	[1.45,1.46]
University long	198337	186374	(94)	1.19	[1.19,1.20]	1.15	[1.14,1.15]	133348	(67)	1.76	[1.74,1.77]	1.55	[1.55,1.56]
Unknown	84,583	55,311	(65)	0.83	[0.83,0.84]	0.94	[0.94,0.95]	23219	(27)	0.72	[0.71,0.73]	0.99	[0.98,1.00]
18–25 y	516888	466404	(90)	1.15	[1.14,1.15]	1.10	[1.10,1.10]	250252	(48)	1.26	[1.26,1.27]	1.31	[1.30,1.32]
Income decilef
1	182514	148030	(81)	1.00	(ref. level)	1.00	(ref. level)	77,743	(43)	1.00	(ref. level)	1.00	(ref. level)
2	182514	146265	(80)	0.99	[0.99,0.99]	1.02	[1.02,1.02]	68,995	(38)	0.89	[0.88,0.90]	0.95	[0.95,0.96]
3	182512	152519	(84)	1.03	[1.03,1.03]	1.05	[1.04,1.05]	80,890	(44)	1.04	[1.03,1.05]	1.05	[1.04,1.06]
4	182515	158389	(87)	1.07	[1.07,1.07]	1.07	[1.07,1.07]	88,308	(48)	1.14	[1.13,1.14]	1.11	[1.10,1.12]
5	182512	163001	(89)	1.10	[1.10,1.10]	1.09	[1.08,1.09]	96,080	(53)	1.24	[1.23,1.24]	1.16	[1.15,1.17]
6	182514	166308	(91)	1.12	[1.12,1.13]	1.10	[1.09,1.10]	102317	(56)	1.32	[1.31,1.33]	1.19	[1.19,1.20]
7	182513	168440	(92)	1.14	[1.14,1.14]	1.10	[1.10,1.10]	106898	(59)	1.38	[1.37,1.38]	1.21	[1.21,1.22]
8	182515	169642	(93)	1.15	[1.14,1.15]	1.10	[1.10,1.11]	108978	(60)	1.40	[1.39,1.41]	1.22	[1.21,1.23]
9	182511	170355	(93)	1.15	[1.15,1.15]	1.10	[1.10,1.11]	111081	(61)	1.43	[1.42,1.44]	1.23	[1.22,1.24]
10	182513	170963	(94)	1.16	[1.15,1.16]	1.10	[1.10,1.10]	109433	(60)	1.41	[1.40,1.42]	1.23	[1.22,1.24]
Unknown	27,990	19,587	(70)	0.86	[0.86,0.87]	1.03	[1.02,1.04]	9,235	(33)	0.78	[0.76,0.79]	1.08	[1.06,1.10]
Gender
Female	902990	815029	(90)			1.00	(ref. level)	506456	(56)			1.00	(ref. level)
Male	950133	818470	(86)			0.97	[0.96,0.97]	453502	(48)			0.85	[0.85,0.85]
Age (y)
<29	795129	709521	(89)			1.00	(ref. level)	381539	(48)			1.00	(ref. level)
30–39	718267	622638	(87)			0.99	[0.99,0.99]	368785	(51)			1.09	[1.08,1.09]
40–44	339727	301340	(89)			1.01	[1.01,1.01]	209634	(62)			1.28	[1.27,1.29]
Immigrant status
Non-immigrant	1414635	1305930	(92)			1.00	(ref. level)	814090	(58)			1.00	(ref. level)
Immigrant	385884	283160	(73)			0.84	[0.84,0.84]	126337	(33)			0.68	[0.67,0.68]
Immigrant parentsg	52,604	44,409	(84)			0.92	[0.92,0.93]	19,531	(37)			0.79	[0.78,0.80]
Residency in Oslo
No	1551143	1364389	(88)			1.00	(ref. level)	802262	(52)			1.00	(ref. level)
Yes	301980	269110	(89)			1.03	[1.03,1.03]	157696	(52)			1.10	[1.09,1.10]
Medical risk grouph
No	1696938	1488843	(88)			1.00	(ref. level)	859305	(51)			1.00	(ref. level)
Yes	156185	144656	(93)			1.04	[1.04,1.04]	100653	(64)			1.20	[1.20,1.20]
SARS-CoV-2i before 2nd dose recommendation
No	1770462	1564977	(88)			1.00	(ref. level)
Yes	82,661	68,522	(83)			0.98	[0.98,0.98]
SARS-CoV-2i before 3rd dose recommendation
No	1263958							819253	(65)			1.00	(ref. level)
Yes	589165							140705	(24)			0.38	[0.37,0.38]
Total
	1853123	1633499	(88)					959958	(52)

^aModified Poisson regression.

^bAll COVID-19 vaccination by 25 August 2022 among all Norwegian residents in the age bracket.

^cRR = relative risk ratio, CI = confidence interval.

^dMutually adjusted for all tabulated variables.

^eHighest attained education level.

^fHousehold income.

^gNorwegian-born with immigrant parents.

^hRegistered diagnosis indicating elevated risk of hospitalization for COVID-19.

ⁱSARS-CoV-2 infection confirmed by laboratory.