Table 2.

Demographic Characteristics by Body Mass Index Class

	BMI Lower Than 25 (n=1476)		BMI 25–30 (n=817)		BMI 30–40 (n=702)		BMI 40 or Higher (n=171)
	n	%	n	%	n	%	n	%	P
Age*	23.4 (4.6)		24.7 (5.2)		25.5 (5.8)		27.0 (5.5)		<0.001
Race									<0.001
Black or African American	458	31.2	437	53.7	455	65.0	131	76.6
White	864	58.9	314	38.6	211	30.1	34	19.9
Other or multiracial	146	9.9	63	7.7	34	4.9	6	3.5
Education									<0.001
High school or less	386	26.2	224	27.4	233	33.2	50	29.2
Some college	611	41.4	388	47.5	324	46.2	90	52.6
College or graduate school	479	32.5	205	25.1	144	20.5	31	18.1
Low socio-economic status									<0.001
No	861	58.4	369	45.2	233	33.2	55	32.2
Yes	614	41.6	448	54.8	469	66.8	116	67.8
Monthly income (US dollar)
None	273	19.2	122	15.2	125	18.2	26	15.3
1–800	514	36.1	274	34.1	181	26.3	52	30.6
801–1600	365	25.7	246	30.6	236	34.3	59	34.7
1601 or higher	271	19.0	162	20.1	146	21.2	33	19.4
Insurance									<0.001
None	529	36.2	359	44.4	320	45.8	96	56.1
Private/student/parent/military	814	55.8	364	45.0	279	39.9	59	34.5
Medicare/Medicaid/disability	117	8.0	86	10.6	100	14.3	16	9.4
Parity									<0.001
0	1070	72.5	435	53.2	297	42.3	78	45.6
1	248	16.8	212	25.9	200	28.5	50	29.2
2	116	7.9	110	13.5	132	18.8	28	16.4
3 or more	42	2.8	60	7.3	73	10.4	15	8.8
History of unintended pregnancy									<0.001
0	812	55.1	323	39.7	232	33.1	61	35.7
1	347	23.6	219	26.9	200	28.6	50	29.2
2	171	11.6	131	16.1	119	17.0	29	17.0
3 or more	143	9.7	141	17.3	149	21.3	31	18.1
History of abortion									<0.001
0	1038	70.3	501	61.3	429	61.1	120	70.2
1	298	20.2	204	25.0	170	24.2	27	15.8
2	106	7.2	71	8.7	66	9.4	16	9.4
3 or more	34	2.3	41	5.0	37	5.3	8	4.7
History of sexually transmitted infections									<0.001
No	991	67.1	473	57.9	364	51.9	85	49.7
Yes	485	32.9	344	42.1	338	48.1	86	50.3
Parity									<0.001
0	1070	72.5	435	53.2	297	42.3	78	45.6
1–2	364	24.7	322	39.4	332	47.3	78	45.6
3 or more	42	2.8	60	7.3	73	10.4	15	8.8
History of unintended pregnancy									<0.001
No	812	55.0	323	39.5	232	33.0	61	35.7
Yes	664	45.0	494	60.5	470	67.0	110	64.3
History of abortion									<0.001
No	1038	70.3	501	61.3	429	61.1	120	70.2
Yes	438	29.7	316	38.7	273	38.9	51	29.8

^*Data are mean (standard deviation).

BMI, body mass index.