Table 3.

Characteristics of sample for whom vaccination data available, by year: practices with individual socioeconomic information

	1997 n = 8334 37 practices1		1998 n = 7944 38 practices2		1999 n = 7294 38 practices		2000 n = 6159 34 practices3		In all years n = 5130 29 practices
	No	%	No	%	No	%	No	%	No	%
Male	3170	38.0	3026	38.1	2753	37.7	5498	34.7	1938	37.8
< 80 yrs	1378	16.5	1116	14.0	735	10.0	815	5.1	948	18.5
80–84 yrs	1105	13.3	1135	14.3	1184	16.2	2857	18.0	677	13.2
>= 85 yrs	687	8.2	775	9.8	834	11.4	5498	11.5	313	6.1
Median age		(80)		(81)		(82)		(82)		(80)
Female	5164	62.0	4918	61.9	4541	62.3	1035	65.3	3192	62.2
<80 yrs	1873	22.5	1509	19.0	1030	14.2	6	7.9	1354	26.4
80–84 yrs	1775	21.3	1760	22.2	1794	24.6	1259	29.7	1109	21.6
>=85 yrs	1516	18.2	1649	20.8	1717	23.5	4711	27.7	729	14.2
Median age		(81)		(82)		(83)		(83)		(81)
Deprivation quintile4
Least deprived	2247	27.0	2206	27.8	2060	28.2	1811	29.4	1429	27.9
2nd quintile	2412	28.9	2269	28.6	2076	28.5	1768	28.7	1468	28.6
3rd quintile	1831	22.0	1767	22.2	1620	22.2	1380	22.4	1155	22.5
4th quintile	1203	14.4	1128	14.2	1025	14.1	790	12.8	708	13.8
Most deprived	641	7.7	574	7.2	513	7.0	410	6.7	370	7.2
Population density5
<250 pers km-2	2578	30.9	2363	29.8	2164	29.7	1944	31.6	1778	34.7
250–1000 pers km-2	2168	26.0	2071	26.1	1905	26.1	1610	26.1	1240	24.2
1000–2500 pers km-2	2382	28.6	2250	28.3	2085	28.6	1591	25.8	1259	24.5
>=2500 pers km-2	1206	14.5	1260	15.9	1140	15.6	1014	16.5	853	16.6
Socioeconomic status6
Owner & c heating	4896	58.8	4737	59.6	4440	60.9	3893	63.2	3225	62.9
without c heating	784	9.4	738	9.3	675	9.2	575	9.3	484	9.4
Renter & c heating	1648	19.8	1557	19.6	1378	18.9	1104	17.9	908	17.7
without c heating	356	4.3	322	4.1	287	3.9	197	3.2	181	3.5
Supported housing	650	7.8	590	7.4	514	7.1	390	6.3	332	6.5

1. 29 practices in all years plus 8 practices in years 1997–1999 2. 29 practices in all years plus 8 practices in years 1997–1999 plus 1 practice in 1998–2000 3. 29 practices in all years plus 4 practices in 2000 only plus 1 practice in 1998–2000 4. Quintiles defined according to distribution of Enumeration Districts in Britain 5. Population density smoothed over a 5-kilometre radius from the centroid of the Enumeration District 6. C heating = central heating. Supported accommodation includes sheltered housing and residential homes