Table 2.

Adverse event rates for influenza vaccine, by age group and pregnancy status

Type of adverse event*	Group (n/N (%))
	6 months to 4 years	5–14 years	15–39 years	40–64 years	≥65 years	Pregnant†	Total
Any adverse event‡	522/6180 (8.4)	295/4415 (6.7)	836/13 434 (6.2)	1533/21 709 (7.1)	1695/28 154 (6.0)	118/2018 (5.8)	4881/73 892 (6.6)
Fever‡	140/5979 (2.3)	54/4266 (1.3)	121/13 020 (0.9)	190/20 953 (0.9)	209/27 222 (0.8)	20/1963 (1.0)	714/71 440 (1.0)
Medical attendance‡	59/6180 (1.0)	21/4415 (0.5)	75/13 434 (0.6)	94/21 709 (0.4)	77/28 154 (0.3)	10/2018 (0.5)	326/73 892 (0.4)

*Denominators differ between any adverse event/medical attendance and fever because reports of fever are solicited in an online survey following the initial short message service (SMS) regarding an adverse event following immunisation (AEFI), and not all participants complete the survey.

†Pregnant participants are also included in their respective age categories (age range: 15–49 years). They are not compared with another group in this table.

‡P<0.001 for participants aged 6 months to 4 years compared with all other age groups.