. 2021 Mar 25;15(5):634–640. doi: 10.1111/irv.12855

TABLE 3.

Incidence rate ratio of Respiratory Syncytial Virus, Influenza A and B among participants with or without cardiopulmonary conditions

	Participants without CPC		Participants with CPC		Crude IRR (95% CI)	Adjusted IRR^d (95% CI)
No. of person	2907		313
Person‐years	5532		558
Endpoints	No.	Rate^a (95% CI)	No.	Rate ^a (95% CI)
ARI^b	1936	350 (337, 363)	360	645 (604, 685)	1.84 (1.64, 2.06)^*	1.84 (1.64, 2.07)^*
SARI^c	20	3.6 (2.2, 5.6)	49	87.8 (65.7, 114.4)	24.30 (14.18, 43.16)^*	24.56 (14.05, 42.95)^*
RSV infection	68	12.3 (9.6, 15.6)	13	23.2 (12.5, 39.5)	1.90 (0.96, 3.46)^*	2.04 (1.11, 3.76)^*
Influenza	90	16.3 (13.1, 20.0)	15	26.9 (15.1, 44.0)	1.65 (0.89, 2.87)	1.86 (1.07, 3.26)^*
Influenza A	78	14.1 (9.9, 16.9)	13	23.3 (12.5, 39.5)	1.65 (0.84, 2.99)	1.83 (1.01, 3.36)^*
Influenza B	12	2.2 (1.1, 3.9)	2	3.6 (0.4, 12.9)	1.65 (0.18, 7.43)	2.04 (0.44, 9.57)

Abbreviations: ARI, acute respiratory illness; CI, confidence interval; CPC, cardiopulmonary conditions; IRR, incidence rate ratio; No., Number; RSV, Respiratory syncytial virus; SARI, severe acute respiratory illness.

^{^a}

Incidence rate / 1000 person‐years.

^{^b}

ARI is defined as a new onset of cough or worsening of chronic cough, with or without fever.

^{^c}

SARI is defined as new onset of cough, worsening of chronic cough or difficulty breathing with a fever ≥ 38.0°C that required hospitalization.

^{^d}

Poisson regression analysis is adjusted for age, sex, current smoking, influenza vaccination, weekly influenza activity, and number of hospital visits.

Statistically significant at P‐value < .05.