Randomised controlled trial comparing uptake of NHS Health Check in response to standard letters, risk-personalised letters and telephone invitations

Table 2 Sample characteristics by trial arm

	Standard letter		Telephone		Personalised letter		Total		Difference
	n	%	N	%	n	%	n	%	χ²	df
Total	1454		1167		1993		4614
Age
40–54	1108	76.2	896	76.8	1462	73.4	3466	75.1	16.00***	2
55–64	224	15.4	207	17.7	382	19.2	813	17.6
65–74	122	8.4	64	5.5	149	7.5	335	7.3
Missing	0		0		0		0
Gender
Male	713	49.0	534	45.8	948	47.6	2195	47.6	2.79	1
Female	741	51.0	633	54.2	1045	52.4	2419	52.4
Missing	0		0		0		0
Ethnicity
White British	1100	93.9	915	95.1	1461	93.3	3476	93.9	3.49	1
Non-WBRI	72	6.1	47	4.9	105	6.7	224	6.1
Missing	282		205		427		914
BMI (kg/m²)
Healthy range	480	33.0	405	34.7	653	32.8	1538	33.3	3.77	3
Overweight	458	31.5	375	32.1	660	33.1	1493	32.4
Obese	312	21.5	240	20.6	380	19.1	932	20.2
Morbidly obese	39	2.7	34	2.9	58	2.9	131	2.8
Missing	165		113		242		520
CVD risk
Low	1295	89.1	1064	91.2	1752	88.0	4111	89.1	9.51	2
Moderate	140	9.6	86	7.4	203	10.2	429	9.3
High	19	1.3	17	1.5	38	1.9	74	1.6
Missing	0		0		0		0
Deprivation (quintile)
1 (most deprived)	226	15.5	180	15.4	379	19.0	785	17.0	39.72***	4
2	285	19.6	233	20.0	469	23.6	987	21.4
3	322	22.1	233	20.0	406	20.4	961	20.8
4	461	31.7	410	35.1	524	26.3	1395	30.2
5	160	11.0	111	9.5	213	10.7	484	10.5
Missing	0		0		2		2
Area morphology
Urban	1121	77.1	851	72.9	1571	78.9	3543	76.8	14.88***	1
Rural	333	22.9	316	27.1	420	21.1	1069	23.2
Missing	0	0.00	0	0.00	2	0.10	2	0.04

ISSN: 1471-2458