na	Symptom survey sample, %	UK demographics, %
Sex
Male	308	36.1	49.9b,c
Female	542	63.9	50.1b,c
Age group, years
18–24	41	4.9	16.5b,c
25–34	103	12.1	22.2b,c
35–44	204	24.0	25.8b,c
45–54	282	33.1	23.0b,c
55–60	220	25.9	12.5b,c
Marital status
Single	112	13.3	42.8b,c
Married/living together	664	78.4	46.2b,c
No longer married	69	8.2	11.0b,c
Social support
Low	34	4.1	n/a
Medium	285	34.0	n/a
High	510	61.9	n/a
Educational status
No formal education	74	8.9	n/a
Secondary school or equivalent	347	41.7	n/a
Higher education	411	49.3	n/a
Housing tenure
Owned/mortgaged	726	86.3	68.4b
Council/housing association rented	70	8.4	16.8b
Privately rented and other	45	5.3	14.8b
Employment status
Full-time	436	51.7	49.7b
Part-time	154	18.4	15.9b
Self-employed	70	8.3	8.6b
Unable to work	40	4.7	21.4
Others not in paid employment	140	16.8	economically inactiveb
Annual household income, £
<15 000	91	11.7	∼20.0b,d
15 000–29 999	201	25.6	∼30.0b,d
30 000–49 999	249	32.1	∼40.0b,d
≥50 000	239	30.6	∼10.0b,d
Ethnic group
White	820	97.9	92.1b
Other	18	2.1	7.9b
Smoking status
Never smoked	484	57.5	53.0e
Ex-smoker	232	27.8	25.0e
Current smoker	123	14.7	21.0e
Chronic condition
Yes	389	46.2	29.0e,f
No	452	53.8	71.0e

n/a = Comparable data not available.

^aTotal numbers for each group may not add up to full sample because of missing data in participant characteristics categories.

^bOffice for National Statistics data.

^cWorking age population specifically (18–60 years).

^dAverage gross income by decile groups of non-retired households.

^eGeneral Lifestyle Survey, 2008.

^fProportion of persons aged 16–64 years who reported a longstanding illness.