. 2022 May 28;51(4):e143–e155. doi: 10.1093/ije/dyac106

Table 1.

Sample size and response in the UK National Diet and Nutrition Survey Rolling Programe Years 1–11 (2008–19)

Core and boost sample combined, unweighted numbers
Sample type	Response (I)	Response (II)	Response (III)	Survey year
				Year 1	Year 2	Year 3	Year 4	Year 5	Year 6	Year 7	Year 8	Year 9	Year 10	Year 11
				2008/9	2009/10	2010/11	2011/12	2012/23	2103/14	2104/15	2015/16	2016/17	2017/18	2018/19
				n	n	n	n	n	n	n	n	n	n	n
Core + country boost	Household response^a		Issued	5049	5265	5265	5994	3726	4424	4424	4648	4424	4480	4340
			Eligible	2367	2345	2319	2826	1688	1937	1948	2154	1980	2061	1859
			Selected	2128	2132	2133	2583	1490	1748	1721	1860	1905	1987	1794
			Productive	1375	1409	1313	1643	982	1124	1136	1143	1056	1009	924
			Response rate %^b	56.0	57.5	54.9	55.5	55.7	55.2	55.4	50.2	50.6	45.7	46.7
	Individual response	Adults	Diet^c	801	812	782	1055	625	663	703	714	647	631	566
			24-h urine^d	473	513	438	650	431	–	–	–	–	–	–
			Spot urine^d	–	–	–	–	–	561	588	571	517	523	486
			DLW sub-study^d	108	–	90	–	–	216	5	–	–	–	–
			Blood	370	450	384	565	372	358	349	355	301	342	335
		Children	Diet^c	845	857	783	893	572	686	650	656	606	580	528
			24-hour urine^d	398	410	372	422	273	–	–	–	–	–	–
			Spot urine^d	–	–	–	–	–	461	402	402	375	347	331
			DLW sub-study^d	93	–	81	–	–	172	6	–	–	–	–
			Blood	206	231	213	252	158	194	156	173	138	144	149
Country boost	Individual response	Scotland	Diet^c	306	306	260	501	–	–	–	–	–	–	–
		Wales	Diet^c	–	167	148	162	158	159	139	199	151	–	–
		Northern Ireland	Diet^c	209	201	210	202	–	169	161	160	157	149	128

DLW, Doubly Labelled Water. Dash = that element of the study was not included that survey year or no country boost sample for that year. 24-h urine samples were collected in Years 1 to 5, spot urine samples in Years 6 to 11 and the doubly labelled water sub-study was included in Years 1, 3, 6 and 7.

The classification of eligible/selected/productive households changed over the National Diet and Nutrition Survey Rolling Programme years and may differ slightly to published reports.

Response is calculation of: the proportion of eligible addresses that are productive multiplied by the proportion of total individuals that are productive. Productive individuals are those that completed 3 or 4 diary days.

Completed 3 or 4 diary days.

^{^d}

Ages 4 years and above only.