Table 5.

Respondent Count by Design Stratum and Year: 2014–2016 National Internet Flu Survey

Stratum	Age (in years)	Race/ethnicitya	Respondent counts by year
			2014 NIFS	2015 NIFS	2016 NIFS
Total			3,325	3, 301	4,305
1	18–49	Hispanic	328	328	323
2		NH white	651	651	636
3		NH black	254	254	256
4		NH other	275	275	279
5	50–64	Hispanic	118	106	200
6		NH white	647	647	716
7		NH black	169	169	280
8		NH other	124	111	182
9	≥65	Hispanic	49	49	93
10		NH white	570	570	1,085
11		NH black	74	74	149
12		NH other	66	67	106
	18–49		1,508	1,508	1,494
	50–64		1,058	1,033	1,378
	≥65		759	760	1,433
		Hispanic	495	483	616
		NH white	1,868	1,868	2,437
		NH black	497	497	685
		NH other	465	453	567
Sample counts			6,771	6,148	7,014

^aThe non-Hispanic (NH) other category includes adults who reported their ethnicity as non-Hispanic and their race as American Indian/Alaska Native, Asian, Native Hawaiian, other Pacific Islander, or reported multiple races.