Table 3.

Attribute estimates, random parameters model

Attributes	Levels	Coefficient (β)a	Standard error	Odds ratio	P-value
Alternative specific constant		1.385	0.067	3.995	< 0.001
Delivery mode	Local vaccination centre	Reference category
	Nearby GP surgery (PCN)	0.105	0.048	1.111	0.028
	Nearby pharmacy	−0.256	0.072	0.774	< 0.001
	Drive-thru	−0.329	0.062	0.720	< 0.001
	Mobile / pop-up	0.003	0.080	1.002	0.973
Appointment time	Monday to Friday, 9 am-5 pm	Reference category
	Monday to Friday, after hours	−0.234	0.056	0.791	< 0.001
	Weekends	−0.057	0.038	0.945	0.134
Proximity from one’s home	Less than 15 min	Reference category
	Between 15 and 30 min	0.154	0.058	1.166	0.008
	Between 30 and 45 min	−0.408	0.054	0.665	< 0.001
SMS invitation sender	NHS	Reference category
	Your GP	−0.065	0.054	0.938	0.232
	Best friend	−0.615	0.056	0.541	< 0.001
Log-likelihood	−11,776
Akaike Information Criteria	23,595

Coefficients, standard errors, odds ratios and p-values of the random parameters model

^a Represents the mean of all individual-specific coefficients within the total sample (n = 2012)