Table 1 .

Summary of DHQ subscores and total score

	Items*	Chronbach's alpha	n	Mean score (95% CI)	Median score (IQR)
Cereals	3	0.551	2264	3.55 (3.51–3.59)	3.67 (3.00–4.33)
Fruit and vegetables	5	0.724	2238	3.61 (3.58–3.65)	3.60 (3.00–4.20)
Food choices	4	0.612	2247	4.02 (3.98–4.06)	4.25 (3.50–4.75)
Food preparation	5	0.510	2226	4.44 (4.41–4.47)	4.70 (4.08–4.93)
Takeaway and snacks	3	0.656	2269	3.99 (3.95–4.03)	4.22 (3.33–4.67)
Fibre	8	0.742	2205	3.59 (3.55–3.62)	3.63 (3.00–4.13)
Fat	13	0.792	2155	4.13 (4.10–4.16)	4.23 (3.69–4.69)
DHQ total score	20	0.842	2087	79.0 (78.5–79.5)	80.3 (70.2–89.0)

n is the number of respondents who completed all items to give rise to the subscore or total score.

*Some items overlap across subscores.