BMC Medical Research Methodology

Table 2 Differences in demographic characteristics of responders and non-responders, overall and by recruitment strategy (n = 13,251)

From: A randomized trial of mail and email recruitment strategies for a physician survey on clinical trial accrual

	Overall (n = 13,251)					Mail-based recruitment (n = 6526)					Email-based recruitment (n = 6725)
	Responder (n = 1072)		Non-responder (n = 12,179)		p-value	Responder (n = 770)		Non-responder (n = 5756)		p-value	Responder (n = 302)		Non-responder (n = 6423)		p-value
	n	%	n	%		n	%	n	%		n	%	n	%
Age (years)					< 0.01					< 0.01					< 0.01
25–34	32	12.4	226	87.6		19	15.7	102	84.3		13	9.5	124	90.5
35–44	406	10.6	3423	89.4		284	14.9	1624	85.1		122	6.4	1799	93.7
45–54	294	7.4	3670	92.6		217	11.1	1742	88.9		77	3.8	1928	96.2
55–64	231	6.9	3111	93.1		165	10.1	1464	89.9		66	3.9	1647	96.2
65+	109	5.9	1749	94.1		85	9.4	824	90.7		24	2.5	925	97.5
Sex					0.01					0.09					0.03
Male	780	8.5	8370	91.5		555	12.3	3975	87.8		225	4.9	4395	95.1
Female	292	7.1	3809	92.9		215	10.8	1781	89.2		77	3.7	2028	96.3
Medical specialty					< 0.01					< 0.01					0.24
Medical oncology	646	7.0	8531	93.0		447	9.8	4100	90.2		199	4.3	4431	95.7
Radiation oncology	378	10.2	3342	89.8		288	15.8	1532	84.2		90	4.7	1810	95.3
Surgical oncology	48	13.6	306	86.4		35	22.0	124	78.0		13	6.7	182	93.3
Geographic region					0.10					0.25					0.40
West	226	8.5	2421	91.5		165	12.6	1150	87.5		61	4.6	1271	95.4
Midwest	240	8.4	2633	91.7		169	11.6	1283	88.4		71	5.0	1350	95.0
Northeast	216	7.0	2858	93.0		157	10.4	1347	89.6		59	3.8	1511	96.2
South	390	8.4	4267	91.6		279	12.4	1976	87.6		111	4.6	2291	95.4

NOTE: Row percentages displayed in table; p-values compare responder to non-responder within each category: overall, mail-based recruitment, and email-based recruitment

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