Table 3

Linear regression analysis to investigate the effect of sex, age, and deprivation on responses to question 5 using the overall mean acceptability score

	Linear regression
	5.1	5.2	5.3	5.4	5.5	5.6	5.7	5.8	5.9	5.10
Predictors	Vouchers	Cash	Small payment	Large payment	Expenses	Extra reward	Targeted	For all	Pay every time	Prize draw
Sex
β	0.083	−0.204	−0.044	−0.075	−0.022	−0.295	−0.180	−0.091	−0.023	−0.098
p	0.663	0.284	0.822	0.662	0.910	0.088	0.344	0.660	0.904	0.599
Age
β	0.405	0.298	0.257	0.420	−0.125	0.516	0.178	0.482	0.207	0.302
p	0.016	0.073	0.134	0.005	0.452	0.001	0.281	0.008	0.220	0.065
Deprivation
β	−0.015	−0.106	−0.181	−0.100	0.030	−0.052	−0.037	−0.107	−0.098	−0.143
p	0.818	0.102	0.007	0.089	0.651	0.368	0.564	0.129	0.135	0.025
R²	0.020	0.027	0.035	0.042	0.003	0.056	0.009	0.035	0.014	0.033

β, regression coefficient; p, significance; NHS, National Health Service.