Table 4.

Interaction effects between attribute levels and sociodemographic characteristics

	Attribute	Gender		Professional category					Age (years)
		Female	Male	Nurse	Nurse Assistant	Other paramedical	Biomedical	Administrative/ Technical	18–34	35–49	50+
		OR (95% CI)
Vaccine efficacy	90%			Ref	Ref	Ref	Ref	Ref	Ref	Ref	Ref
	50%			0.05	0.07	0.05	0.06	0.05	0.07	0.05	0.05*
				(0.04 to 0.07)					(0.05 to 0.09)
	90%, severe cases			1.93	1.87	1.81	1.18**	1.60	1.84	1.82	1.42
				(1.53 to 2.43)					(1.46 to 2.33)
Indirect protection	Unknown								Ref	Ref	Ref
	Individual protection only								0.53	0.42	0.55
									(0.39 to 0.71)
	Control of epidemic								4.77	2.53***	2.43***
									(3.44 to 6.61)
	Safely meet older people								6.84	3.76***	3.08***
									(5.10 to 9.17)
Vaccine safety	Absence of severe and frequent side effects	Ref	Ref	Ref	Ref	Ref	Ref	Ref	Ref	Ref	Ref
	Benefit>risk, even for young	0.37	0.52*	0.35	0.41	0.52*	0.60**	0.34	0.33	0.46*	0.39
		(0.32 to 0.44)		(0.27 to 0.45)					(0.25 to 0.43)
	Strictly monitored across EU	0.37	0.51*	0.39	0.45	0.47	0.46	0.32	0.28	0.42**	0.46**
		(0.31 to 0.43)		(0.30 to 0.49)					(0.21 to 0.36)
Protection duration	Annual vaccination								Ref	Ref	Ref
	Unknown duration								0.67	0.49	0.40**
									(0.52 to 0.87)
	Probably 3 years								1.24	1.36	0.94
Recommendation/ incentive	MoH asks			Ref	Ref	Ref	Ref	Ref	Ref	Ref	Ref
	Experts without CoI			1.04	0.67*	1.11	0.85	1.12	0.79	0.96	1.14*
									(0.62 to 1.01)
	80% HCWs EU			1.47	1.16	1.43	1.23	1.25	1.16	1.44	1.31
				(1.16 to 1.84)					(0.91 to 1.47)

ConjointVac survey among 4346 healthcare and welfare sector workers in France, 18 December 2020 to 1 February 2021.

Asterisks represent the significance level of interaction terms of the given subgroup with the attribute level: *p<0.05; **p<0.01; ***p≤0.001.

95% confidence intervals (95% CIs) of the main effects in the given subgroup are shown, if they do not overlap 1 (p<0.05).

Lecture note:≥50-year-old participants have significantly (p≤0.001) lower preference weights (OR) to contributing to epidemic control compared with those in the reference group (18-year-old to 34-year-old participants). The effect of ‘control of epidemic’ is significant (p<0.05) only among the group of 18-year-old to 34-year-old participants.

CoI, conflict of interest; EU, European countries; HCWs, healthcare workers; MoH, Ministry of Health.