Table 2.

Participant characteristics. Data are from the National Diet and Nutrition Survey Rolling Programme Years 1–4 (2008–2012) for all respondents aged 11 to 18 years [29].

		N	%	% (Weighted Sample)
Age (years)	11–15	543	61.4	60.8
	16–18	341	38.6	39.2
Sex	Male	445	50.3	51.3
	Female	439	49.7	48.7
Ethnicity (%)	White	778	88	86.2
	Non-white	106	12	13.8
Occupational group (SES) *	1. Higher managerial, administrative and professional occupations	126	14.3	14.6
	2. Lower managerial, administrative and professional occupations	236	26.7	24.6
	3. Intermediate occupations	73	8.3	7.4
	4. Small employers and own account workers	94	10.6	11.2
	5. Lower supervisory and technical occupations	90	10.2	9.7
	6. Semi-routine occupations	125	14.1	14.6
	7. Routine occupations	91	10.3	11.5
	8. Never worked and long-term unemployed	29	3.3	4.3
	Missing	20	2.3	2.2
BMI (%)	Normal weight	553	62.6	62.7
	Overweight	124	14.0	14.5
	Obese	175	19.8	19.8
	Missing	32	3.6	3
Drinking (%)	Yes **	132	14.9	13.8
	No (once or twice a months or less)	752	85.1	86.2
Smoking (%)	Yes ***	91	10.3	10.4
	No	793	89.7	89.6

* nssec8 social and economic status classification from the Office for National Statistics [54]. ** Collapsed from the following original categories: almost every day, twice a week, once a week, and once a fortnight. *** Collapsed Smoking (category: current smoker) and Smoking Frequency (category: smoke cigarettes once a week or more often) variables.