Table 1. Number of children consenting and reasons for exclusion in 1999–2000 and 2009–10.

	1999–2000	2009–10
Number consenting	n = 424	n = 295
Reasons for exclusion:
From non-comparable school*	19	–
Mixed lunch†	96	73
No postcode	6	7
Completed less than 6 food diary days	5	0
Number included in analysis	298	215

*Non-comparable school: one school had closed from 1999–2000 to 2009–10.

^†Mixed lunch means a child having both a school and home-packed lunch.