Table 3.

Estimated coefficients from the fitted linear regression models for prediction of S-RDGI scores (S-RDGI1 and S-RDGI2) ¹ from the scores of the sub-sets of survey items (n = 555).

Survey Item	Standard Deviation (SD)	Coefficient	p-Value	95% CI
Six item score: S-RDGI1
Intercept		37.694		35.39, 39.99
Vegetables	2.191	1.387	<0.001	1.17, 1.61
Fruit	2.692	1.375	<0.001	1.20, 1,55
Red meat	1.546	1.438	<0.001	1.13, 1.75
Chips	0.457	2.931	<0.001	1.85, 4.01
Meat products	0.508	1.130	0.026	0.14, 2.12
Milk type	0.735	2.401	<0.001	1.77, 3.03
Nine item score: S-RDGI2
Intercept		30.555		28.37, 32.74
Vegetables	2.191	1.287	<0.001	1.10, 1.47
Fruit	2.692	1.265	<0.001	1.11, 1.42
Red meat	1.546	1.322	<0.001	1.06, 1.58
Chips	0.457	2.172	<0.001	1.24, 3.10
Meat products	0.508	0.913	0.033	0.07, 1.75
Milk type	0.735	2.233	<0.001	1.70, 2.77
Fish	1.432	0.984	<0.001	0.70, 1.26
Alcohol (days/week)	1.722	1.246	<0.001	1.01, 1.48
Alcohol (drinks/day)	1.451	0.807	<0.001	0.52, 1.09

¹ Prediction of S-RDGI1 scores was based on the six survey items (independent variables) and RDGI scores (dependent variable). Prediction of S-RDGI2 scores was based on the nine survey items (independent variables) and RDGI scores (dependent variable).