Table 1.

Ratio of relative frequencies (RRFs) for demographic, disease, and neighborhood characteristics between participants in the SJLIFE and the evaluable source population as of October 31, 2011.

	Evaluable source population (N=3,108)		Participants (n=1,766)		RRF	95% confidence limits
	N	%	n	%		Lower	Upper
Individual-level characteristics
Sex
Males	1667	53.6	882	49.9	0.93	0.90	0.96
Females	1441	46.4	884	50.1	1.08	1.04	1.12
Race
White	2672	86.0	1536	87.0	1.01	1.00	1.03
Non-White	436	14.0	230	13.0	0.93	0.84	1.02
Age at contact date
18 – 30	1401	45.1	789	44.7	0.99	0.95	1.03
31 – 40	1160	37.3	674	38.2	1.02	0.98	1.07
≥ 41	547	17.6	303	17.2	0.97	0.90	1.05
Distance from home to SJCRHa (miles)
0 – 100	652	21.0	401	22.7	1.08	1.02	1.15
101 – 250	761	24.5	412	23.3	0.95	0.89	1.02
251– 500	1214	39.1	671	38.0	0.97	0.93	1.01
≥ 500	481	15.5	282	16.0	1.03	0.95	1.11
Age at primary cancer diagnosis
0 – 2	676	21.8	380	21.5	0.99	0.92	1.05
3 – 5	705	22.7	407	23.1	1.02	0.95	1.08
6 – 8	429	13.8	239	13.5	0.98	0.90	1.07
9 – 11	379	12.2	211	12.0	0.98	0.88	1.08
12 – 14	424	13.6	247	14.0	1.03	0.93	1.12
15 – 17	378	12.2	215	12.1	1.00	0.90	1.10
≥ 18	117	3.8	67	3.8	1.01	0.82	1.19
Years from diagnosis to contact date
10–14	283	9.1	169	9.6	1.05	0.94	1.16
15 – 19	585	18.8	332	18.8	1.00	0.92	1.07
20 – 24	745	24.0	427	24.2	1.01	0.95	1.07
25 – 29	672	21.6	374	21.2	0.98	0.92	1.05
30 – 34	445	14.3	248	14.0	0.98	0.89	1.07
35 – 39	262	8.4	157	8.9	1.05	0.94	1.17
≥ 40	116	3.7	59	3.3	0.90	0.72	1.07
Disease group
Bone tumors	202	6.5	124	7.0	1.08	0.95	1.22
CNS tumors	247	8.0	137	7.8	0.98	0.86	1.09
Embryonal tumors	556	17.9	278	15.7	0.88	0.80	0.95
Leukemias	1219	39.2	769	43.5	1.11	1.07	1.16
Lymphomas	645	20.8	349	19.8	0.95	0.88	1.02
Soft tissue sarcomas	176	5.7	78	4.4	0.78	0.64	0.93
Others	63	2.0	31	1.8	0.87	0.61	1.13
Treatment era
1962 – 1969	125	4.0	69	3.9	0.97	0.80	1.14
1970 – 1979	723	23.3	435	24.6	1.06	1.00	1.12
1980 – 1989	1318	42.4	737	41.7	0.98	0.94	1.03
1990 – 2002	942	30.3	525	29.7	0.98	0.93	1.03
Group-level Characteristics
Education
≤ High school diploma/general equivalency diploma	2390	77.0	1341	75.9	0.99	0.97	1.01
> High school diploma/general equivalency diploma	718	23.1	425	24.1	1.04	0.98	1.11
Median household income
≤ $29,999	533	17.2	274	15.5	0.90	0.83	0.99
$30,000 – $59,999	1775	57.1	1003	56.8	0.99	0.96	1.03
≥ $60,000	800	25.7	489	27.7	1.08	1.02	1.13
Median home value
≤ $99,999	1254	40.4	671	38.0	0.94	0.90	0.98
$100,000 – $149,999	841	27.1	477	27.0	1.00	0.94	1.05
$150,000 – $199,999	525	16.9	324	18.4	1.09	1.01	1.16
≥ $200,000	488	15.7	294	16.7	1.06	0.98	1.15
Urbanicity
Metropolitan area	2069	66.6	1212	68.6	1.03	1.01	1.06
Micropolitan area	485	15.6	259	14.7	0.94	0.86	1.03
Small town area	377	12.1	209	11.8	0.98	0.88	1.07
Rural area	177	5.7	86	4.9	0.86	0.71	1.01

^aSt. Jude Children’s Research Hospital