Three-year COVID-19 and flu vaccinations among medical residents in a tertiary hospital in Italy: The threat of acceptance decline in seasonal campaigns

Figures & data

Table 1. Sociodemographic characteristics of the 2022–2023 sample.

		2022–2023 sample		2021–2023 restricted sample
Sociodemographic characteristics		Mean	Standard deviation	Mean	Standard deviation
Age		28.97	3.44	29.38	3.14
		Number	Percentage	Number	Percentage
Gender	Male	891	45.27	663	45.26
	Female	1077	54.73	802	54.74
Year of residency	1	447	22.71	13	0.89
	2	912	46.34	859	58.63
	3	108	5.49	97	6.62
	4 or 5	501	25.46	496	33.86
Frontline residency°	Yes	594	30.18	997	68.05
	No	1374	69.82	468	31.95
Vaccine-related characteristics
Received COVID-19 second booster dose		370	18.80	262	17.88
Received COVID-19 second booster dose within residency hospital		323	87.30	236	90.08
Documented COVID-19 infection in the previous 4 months		164	8.33	141	9.62
Open-Day of COVID-19 vaccination campaign	1	99	30.65	82	34.75
	2	77	23.84	49	20.76
	3	70	21.67	48	20.34
	4	87	23.84	57	24.15
Influenza vaccine		320	16.26	233	15.90
Open-Day of influenza vaccination campaign	1	97	30.31	80	34.33
	2	82	25.63	52	22.32
	3	75	23.44	51	21.89
	4	66	20.63	50	21.46
Coadministration of COVID-19 and influenza vaccines in the same day		306	94.74	225	95.34

°Involvement in managing COVID-19 patients or participating in the vaccination campaign.

Table 2. Logistic regression models for COVID-19 vaccination and COVID-19 vaccination performed within the residency hospital for 2022–2023 sample and reduced sample (*p < .05, statistically significant).

		2022–2023 sample			2021–2023 restricted sample
Received COVID-19 second booster dose vaccination		Odds Ratio	95% Confidence Interval	p value	Odds Ratio	95% Confidence Interval	p value
Gender	Male	1(reference)			1(reference)
	Female	1.265	[1.003–1.594]	.047*	1.258	[0.968–1.652]	.099
Frontline residency°	No	1(reference)			1(reference)
	Yes	1.716	[1.254–2.174]	<.001*	1.518	[1.150–2.004]	.003*
Year of residency	1	1(reference)			1(reference)
	2	0.625	[0.471–0.831]	.001*	0.829	[0.621–1.105]	.201
	3	0.935	[0.562–1.553]	.795	1.387	[0.839–2.321]	.212
	4	0.763	[0.556–1.046]	.093	1
Gender	Male	1(reference)			1(reference)
	Female	0.766	[0.393–1.456]	.404	0.626	[0.259–1.514]	.298
Frontline residency°	No	1(reference)			1(reference)
	Yes	0.943	[0.499–1.781]	.857	0.832	[0.362–1.913]	.666
Year of residence	1	1(reference)			1(reference)
	2	3.457	[1.549–7.714]	.002*	1
	3	1.257	[0.387–4.084]	.703	0.375	[0.107–1.317]	.126
	4	1.815	[0.836–3.938]	.131	0.549	[0.225–1.340]	.188

°Involvement in managing COVID-19 patients or participating in the vaccination campaign.