Table 1.

Characteristics of participants in the follow-up postal questionnaire pilot study, Navajo EARTH Study, 2005–2006.

	Long (N = 794)		Short (N = 792)		p	Total (N = 1586)
	No.	%a	No.	%a		No.	%a
Sex					0.47
Male	280	35.3	293	37.0		573	36.1
Female	514	64.7	499	63.0		1013	63.9
Age					0.01
18–29	236	29.7	204	25.8		440	27.7
30–39	194	24.4	156	19.7		350	22.1
40–49	183	23.0	221	27.9		404	25.5
50–59	118	14.9	145	18.3		263	16.6
60+	63	7.9	66	8.3		129	8.1
Education					0.67
Less than high school	197	24.8	193	24.4		390	24.6
High school or equivalent	213	26.8	228	28.8		441	27.8
Beyond high school	382	48.1	368	46.5		750	47.3
Other	2	0.3	3	0.4		5	0.3
Current employment					0.78
Currently employed	338	42.6	363	45.8		701	44.2
Not currently employed	220	27.7	205	25.9		425	26.8
Student	76	9.6	66	8.3		142	9.0
Retired	37	4.7	34	4.3		71	4.5
Disabled	13	1.6	14	1.8		27	1.7
Homemaker	90	11.3	96	12.1		186	11.7
Other	19	2.4	14	1.8		33	2.1
Post office box					0.93
Address is post office box	740	93.2	739	93.3		1479	93.3
Other address	54	6.8	53	6.7		107	6.7
Years at address					0.66
Less than 1 year	93	11.7	82	10.4		175	11.0
1–5 years	199	25.1	185	23.4		384	24.2
6–10 years	100	12.6	108	13.6		208	13.1
11+ years	401	50.5	411	51.9		812	51.2
Language at home					0.21
Native	83	10.5	78	9.8		161	10.2
English	248	31.2	215	27.1		463	29.2
Both	458	57.7	484	61.1		942	59.4
Other	1	0.1	5	0.6		6	0.4
Contact name					0.43
No	53	6.7	61	7.7		114	7.2
Yes	741	93.3	731	92.3		1472	92.8
Contact phone					0.16
No	88	11.1	106	13.4		194	12.2
Yes	706	88.9	686	86.6		1392	87.8
Signed medical consent					0.05
No	58	7.3	80	10.1		138	8.7
Yes	736	92.7	712	89.9		1448	91.3
Gave social security number					0.01
No	112	14.1	150	18.9		262	16.5
Yes	682	85.9	642	81.1		1324	83.5
Diet history questionnaire outlier					0.60
No	608	76.6	614	77.5		1222	77.0
Yes	165	20.8	156	19.7		321	20.2
Household participants					0.36
One	440	55.4	457	57.7		897	56.6
More than one	354	44.6	335	42.3		689	43.4
Phone					0.31
Home phone	518	65.2	483	61.0		1001	63.1
Cell only	98	12.3	104	13.1		202	12.7
Other phones	146	18.4	164	20.7		310	19.5
No phone	32	4.0	41	5.2		73	4.6

^aPercentages do not add up to 100 due to item nonresponse.