Table 1.

Summary of demographic characteristics and risk status (safety set)

Dose 1	Belgium N = 306		Germany N = 288		Spain N = 460		Total N = 1054
Age at dose 1 vaccination with GSK’s IIV4
Mean (SD), years	66.4 (12.6)		66.2 (13.2)		17.0 (19.1)		44.8 (29.2)
Median, years	69.0		68.0		7.0		54.5
Minimum	24 years		18 years		6 months		6 months
Maximum	89 years		88 years		64 years		89 years
Age category	n	%	n	%	n	%	n	%
6 months–17 years	0	0.0	0	0.0	321	69.8	321	30.5
18–65 years	114	37.3	121	42.0	139	30.2	374	35.5
> 65 years	192	62.7	167	58.0	0	0.0	359	34.1
Sex
Female	160	52.3	170	59.0	236	51.3	566	53.7
Male	146	47.7	118	41.0	224	48.7	488	46.3
Geographic ancestry
Black or African American	0	0.0	0	0.0	1	0.2	1	0.1
American Indian or Alaska native	0	0.0	0	0.0	8	1.7	8	0.8
Asian—South-East Asian heritage	0	0.0	2	0.7	5	1.1	7	0.7
White—Arabic/North African heritage	0	0.0	3	1.0	3	0.7	6	0.6
White—Caucasian/European heritage	304	99.3	283	98.3	443	96.3	1030	97.7
Other	2	0.7	0	0.0	0	0.0	2	0.2
Risk status for influenza-associated morbidity and mortalitya
At risk	209	68.3	237	82.3	303	65.9	749	71.1
Not at risk	97	31.7	51	17.7	157	34.1	305	28.9

Dose 2					Spain N = 96		Total N = 96
Age at dose 1 vaccination with GSK’s IIV4
Mean (SD), years					3.3 (2.4)		3.3 (2.4)
Median, years					3.0		3.0
Minimum					6 months		6 months
Maximum					8 years		8 years
Age category					n	%	n	%
6 months–17 years					96	100	96	100
Sex
Female					52	54.2	52	54.2
Male					44	45.8	44	45.8
Geographic ancestry
American Indian or Alaska native					1	1.0	1	1.0
White—Caucasian/European heritage					95	99.0	95	99.0
Risk status for influenza-associated morbidity and mortalitya
At risk					69	71.9	69	71.9
Not at risk					27	28.1	27	28.1

IIV4 inactivated quadrivalent seasonal influenza vaccine, N number of participants, n/% number/percentage of participants in a given category, SD standard deviation

^aAssessed by a healthcare professional on the basis of their judgement and experience