Table I.

Description of Study Population by Neck Pain, Demographic Characteristics

Variable	Weighted Count (million)	Weighted% in the population	Weighted % Neck pain	Unadjusted OR	95%Conf.	p
Demographic characteristics
Age
18 – 25	19	15.3	10.0	1.0
26 – 40	44	34.6	13.1	1.4	(1.1–1.7)	<0.001
41 – 55	46	36.7	16.4	1.8	(1.4–2.2)	<0.001
56 – 64	17	13.4	16.5	1.8	(1.4–2.3)	<0.001
Gender
Male	67	53.1	12.0	1.0
Female	59	46.9	16.9	0.7	(0.6–0.8)	<0.001
Ethnicity and race
Non-Hispanic White	85	67.8	15.2	1.0
Non-Hispanic Black	14	10.9	11.4	0.7	(0.6–0.9)	<0.001
Hispanic	18	14.7	13.2	0.9	(0.7–1.0)	<0.001
Non-Hispanic Asian	6	4.9	10.2	0.6	(0.5–0.8)	<0.001
Non-Hispanic Others	2	1.8	17.8	1.2	(0.8–1.8)	<0.001
Socioeconomic Status
Education
Less than high school	15	12.2	15.0	1.0
High school	28	22.0	12.4	0.8	(0.7–1.0)	0.03
Some college	40	31.8	17.3	1.2	(1.0–1.4)	0.03
College	28	22.0	12.4	0.8	(0.7–1.0)	0.04
Master and above	15	12.0	12.8	0.9	(0.7–1.1)	0.17
Earning
< $14,999	19	19.0	14.9	1.0
$15,000 – $34,999	31	30.5	15.0	1.2	(1.0–1.4)	0.10
$35,000 – $64,999	31	30.3	14.8	1.1	(1.0–1.3)	0.10
> =$65,000	20	20.3	14.8	1.1	(1.0–1.4)	0.20
Other Health related factors
Leisure-time physical activity
No	61	48.3	14.7	1.0
Yes	65	51.7	13.8	0.9	(0.8–1.0)	0.20
Serious Psychological Distress
No	120	97.5	13.7	1.0
Yes	3	2.5	34.7	3.3	(2.4–4.5)	<0.001