Table 1. Weighted demographic characteristics of the study population across 3 influenza seasons. An online cross-sectional study of US residents 13 and older was carried out to assess self-reported demographics and influenza testing in the last 30 days for the 2021‐2022 (n=335,964), 2022‐2023 (n=334,584), and 2023‐2024 (n=269,624) seasons. This table displays the demographics of the study population. Proportion uses an inverse probability of survey selection weighting scheme targeting the US census. Numbers are unweighted and reflect the number of individuals in each demographic group during each influenza season.

Demographics		Seasona
		2021‐2022 (N=335,964)		2022‐2023 (N=334,584)		2023‐2024 (N=269,624)
		N	Weighted %	N	Weighted %	N	Weighted %
Gender
Male		129,233	47.1	100,980	47.1	66,401	47.1
Female		200,684	50.6	160,850	50.8	105,135	50.6
Not listed or nonconforming		6047	2.3	5276	2.1	4094	2.2
Race
White		217,482	62.1	160,169	61.8	102,610	61.7
Black		46,759	16.7	39,214	16.9	26,417	17.1
Hispanic		43,561	12.5	35,636	12.6	23,210	12.5
Asian		16,029	5.7	12,326	5.4	9119	5.4
No Answer		12,133	3.0	87,239	3.3	108,268	3.3
Education
Did not complete high school		10,668	8.9	9871	8.7	7893	9.4
High school or General Educational Development diploma		57,899	33.3	51,033	33.2	36,531	32.8
Associate’s degree		32,592	9.1	25,602	9.5	16,269	9.4
Some college		66,617	19.5	51,577	19.4	33,148	19.2
College graduate		91,664	18.2	70,289	18.3	44,833	18.3
Postgraduate degree		76,524	10.9	58,734	10.9	36,956	10.9
Age (years)
13‐17		4457	7.1	3745	6.5	2997	7.1
18‐24		21,420	11.2	16,655	11.1	11,628	10.9
25‐34		43,489	16.7	33,772	16.8	22,153	16.7
35‐44		56,378	15.5	44,276	15.6	28,582	15.5
45‐54		67,123	14.9	51,021	15.0	33,070	14.9
55‐64		73,204	15.4	57,222	15.5	36,723	15.5
65 and older		69,893	19.3	60,415	19.5	40,477	19.5
Income (US $)
Under $15,000		30,200	12.8	25,095	13.4	16,376	14.2
Between $15,000 and $29,999		35,390	13.2	26,565	12.9	16,002	12.4
Between $30,000 and $49,999		46,445	15.4	34,833	15.4	20,741	15.3
Between $50,000 and $74,999		50,944	15.1	36,881	15.0	22,096	15.1
Between $75,000 and $99,999		42,361	11.5	29,940	11.3	17,337	11.0
Between $100,000 and $150,000		52,730	12.9	37,042	12.9	21,364	12.9
Over $150,000		55,466	12.2	28,954	12.2	22,557	12.2
No Answer		22,423	6.9	105,274	6.9	133,151	7.0
Insurance
Plan through your spouse, parent, or employer		151,845	39.8	99,236	36.9	54,920	35.0
Other (please specify)		20,200	6.7	8921	3.8	—b	—
Plan you purchased yourself		37,674	10.3	27,863	10.5	16,670	10.5
Medicare		67,835	21.5	56,337	23.1	35,013	23.3
Medicaid or Medical		26,810	9.9	24,050	11.7	15,039	11.9
TRICARE		6333	1.9	4737	1.9	2672	1.8
Not covered by health insurance		19,231	7.7	13,817	7.1	9405	8.0
No Answer		6034	2.2	99,623	5.1	135,905	9.5
Industry
Non–health carec		76,586	78.7	133,084	79.0	177,869	79.9
Health care		25,770	21.3	44,387	21.0	57,672	20.1

^aPlease refer to Table S1 in Multimedia Appendix 1 for the specific date ranges of the 2021-2022, 2022-2023, and 2023-2024 seasons.

^bNot applicable.

^cNon–health care is a condensed group that consists of all occupations except health care. To see the complete breakdown of non–health care occupations, refer to Table S2 in Supplement Table 2Multimedia Appendix 1.