Table 2.

Demographic Characteristics and SF-12 Physical Component and Mental Component Summary Scores, Entire Study Population

	Weighteda column %			Weightedb column %
Characteristic	SF-12 PCS≥50	SF-12 PCS<50	p	SF-12 MCS≥50	SF-12 MCS<50	p
Total, weighted	42.1 million	13.1 million		32.3 million	23.0 million
Age (years)
18–30	41	27	<0.0001	37	38	0.03
31–40	30	30		30	30
41–50	29	43		33	31
Race
White/Caucasian	80	75	<0.0001	78	79	0.003
Black/African-American	12	17		14	13
Other	8	9		8	7
Ethnicity
Hispanic	15	16	0.002	15	16	<0.0001
Not Hispanic	85	84		85	84
Years of education
<12	14	21	<0.0001	14	18	<0.0001
12	27	34		28	29
13–15	27	25		27	26
≥16	32	20		31	26
Marital status
Married	50	49	<0.0001	53	46	<0.0001
Divorced/separated/widowed	12	19		12	17
Never married	37	32		35	37
Employment status
Employed	81	69	<0.0001	80	75	<0.0001
Not employed	19	31		20	25
Total income
<$6,740	22	26	<0.0001	23	24	<0.0001
$6,740–19,999	21	28		21	25
$20,000–39,999	26	26		26	26
≥$40,000	30	20		30	24
BMI
<25 kg/m2	54	34	<0.0001	52	46	<0.0001
25 to <30 kg/m2	26	25		25	26
≥30 kg/m2	20	40		23	28

Note: Percentages may not sum to 100 due to rounding.

^aWeighted values are average annual estimates over the 2002–2010 time period, based on available data (52,328 records).

^bWeighted values are average annual estimates over the 2002–2010 time period, based on available data (51,657 records).

MCS, mental component summary score; PCS, physical component summary score; SF-12, Short form, 12 items.