Table 1.

Risk of RSV-associated hospital admission in children in Denmark, by age group

	Population, n	RSV-associated hospital admissions, n*		Risk per 100 000 population (95% CI)		Risk ratio (95% CI)†; p value‡
		2016–17 to 2019–20§	2021–22	2016–17 to 2019–20	2021–22
Total	310 423	1477 (226)	3000	476 (464–488)	966 (932–1001)	2·0 (1·9–2·1); p<0·0001
<3 months	15 459	529 (56)	1162	3422 (3280–3568)	7517 (7106–7944)	2·2 (2·1–2·4); p<0·0001)
3–5 months	15 459	270 (43)	403	1747 (1645–1853)	2607 (2361–2870)	1·5 (1·3–1·7); p<0·0001
6–11 months	30 918	246 (46)	367	796 (747–847)	1187 (1069–1314)	1·5 (1·3–1·7) p<0·0001
12–17 months	30 937	221 (53)	396	714 (668–763)	1280 (1158–1412)	1·8 (1·6–2·0); p<0·0001
18–23 months	30 937	109 (28)	246	352 (320–387)	795 (699–901)	2·3 (1·9–2·6); p<0·0001
24–35 months	61 635	73 (20)	273	118 (105–133)	443 (392–499)	3·7 (3·2–4·4); p<0·0001
36–47 months	62 454	20 (5)	98	32 (25–40)	157 (127–191)	4·9 (3·7–6·6); p<0·0001
48–59 months	62 624	10 (4)	55	16 (11–22)	88 (66–114)	5·5 (3·7–8·3); p<0·0001

RSV=respiratory syncytial virus.

^*Defined as a hospital contact of >12 h and a positive RSV test during hospital admission or within 5 days.

^†2021–22 vs 2016–17 to 2019–20 winter seasons.

^‡p values derived from Fisher's exact test.

^§Mean (SD) number of annual RSV-related hospital admissions (2016–17 to 2019–20 winter seasons).