Table 1.

Socio‐demographic characteristics of the sample and 2009 H1N1 and seasonal influenza vaccination coverage estimates, National 2009 H1N1 Flu Survey (NHFS), October 2009–June 2010 interviews, United States

	n	Demographic distribution*	2009 H1N1 vaccination**	Seasonal influenza vaccination**
		%±95% CI***	%±95% CI	%±95% CI
Overall	55 850	100	24·5 ± 0·9	43·1 ± 0·9
Race/ethnicity
a. Hispanic	3612	13·7 ± 0·7	21·2 ± 3·8b,c	30·3 ± 3·1b,c,d
b. Black, non‐Hispanic	4490	11·4 ± 0·6	16·6 ± 2·4a,c,d	34·9 ± 3·0a,c,d
c. White, non‐Hispanic	44 472	68·5 ± 0·8	26·4 ± 1·0a,b	47·3 ± 1·0a,b,d
d. Other, non‐Hispanic	3276	6·4 ± 0·4	24·4 ± 3·7b	40·3 ± 3·6a,b,c
Income†
a. Above poverty, >$75 K/year	14 259	26·5 ± 0·7	30·2 ± 1·7b,c,d	48·9 ± 1·7b,c,d
b. Above poverty, ≤$75 K/year	26 719	43·7 ± 0·8	24·0 ± 1·4a,d	43·9 ± 1·3a,c,d
c. At or below poverty	5513	12·5 ± 0·6	20·9 ± 3·1a	31·2 ± 2·7a,b,d
d. Unknown	9359	17·3 ± 0·6	19·6 ± 1·8a,b	41·0 ± 2·3a,b,c
Education
a. <12 years	4950	11·6 ± 0·6	21·8 ± 4·3d	35·2 ± 3·2b,c,d
b. 12 years	12 056	22·0 ± 0·7	22·2 ± 1·9d,e	40·7 ± 1·9a,d
c. Some college	14 731	28·3 ± 0·8	22·5 ± 1·6d,e	40·7 ± 1·7a,d
d. College graduate	21 170	38·1 ± 0·8	29·3 ± 1·4a,b,c,e	49·7 ± 1·4a,b,c,e
e. Unknown	2943	6·3 ± 0·4	17·9 ± 3·1b,c,d	36·5 ± 4·3d
Sex
a. Men	22 714	48·1 ± 0·8	23·5 ± 1·4b	39·8 ± 1·4b
b. Women	33 136	51·9 ± 0·8	25·4 ± 1·2a	46·2 ± 1·2a
Priority group for pH1N1††
Yes	20 677	41·9 ± 0·8	30·2 ± 1·7
18–24 years old	3924	12·6 ± 0·6	19·6 ± 2·5
High‐risk medical condition†††	15 128	24·8 ± 0·7	33·0 ± 2·3
Health care personnel	5952	11·3 ± 0·5	46·1 ± 3·8
Close contact <6 months old	4540	9·7 ± 0·5	35·2 ± 4·5
No	35 173	58·1 ± 0·8	20·4 ± 1·0
25–64 years no priority group	22 526	43·2 ± 0·8	18·1 ± 1·2
65+ years no priority group	12 647	14·8 ± 0·5	27·2 ± 1·9
Recommended group for seasonal
Yes	40 914	63·7 ± 0·8		52·8 ± 1·1
High‐risk medical condition	15 128	24·8 ± 0·7		57·2 ± 1·8
Health care personnel	5952	11·3 ± 0·5		62·0 ± 2·8
Close contact <6 months old	4540	9·7 ± 0·5		44·7 ± 3·3
50–64 years old	17 357	24·9 ± 0·6		49·4 ± 1·7
65+ years old	14 210	16·6 ± 0·5		72·0 ± 1·7
No	14 936	36·3 ± 0·8		25·9 ± 1·4

*Sample characteristics are based on October 2009 through June 2010 interview data.

**The Kaplan–Meier survival analysis procedure was used to estimate vaccination coverage using November through June interview data for 2009 H1N1 and October through June interview data for seasonal influenza. The presence or absence of superscripted letters denotes whether that estimate was statistically significantly different at P < 0·05 from another row, and denotes which row it differed from (a, b, c, d, or e), based on pair‐wise comparison t‐test. Pair‐wise comparisons were not carried out for the priority and recommended groups because they consist of overlapping groups.

***95% Confidence Interval half‐width.

^†Poverty level based on reported income and number of persons in the household and using U.S. poverty thresholds.

^††Priority group for 2009 H1N1 defined as: 18–24 years, high‐risk medical condition, health care worker, close contact with children <6 months, or pregnant women. Pregnant women were not broken out separately in Table 1 for either pH1N1 or seasonal; these estimates have been published. ⁸

^†††High‐risk medical condition was defined as having a high‐risk condition associated with serious complications following influenza infection including current asthma or other underlying medical condition (i.e., a lung condition other than asthma, a heart condition, diabetes, a kidney condition, a liver condition or a weakened immune system caused by a chronic illness or by medicines taken for a chronic illness).