. 2009 May;70(3):458–466. doi: 10.15288/jsad.2009.70.458

Table 1.

Characteristics of the 3,020 white and 494 black female twin participants in the Missouri Adolescent Female Twin Study by body mass index (BMI) category (all numbers are percentages unless otherwise noted)

Variable	BMI category				P
Variable	Underweight	Ideal weight	Overweight	Obese	P
Whites	(n = 235)	(n = 2,023)	(n = 460)	(n = 302)
Ever had a drink	79.24^a	87.99^b	87.83^b	88.12^b	.006
Age at first drink, mean (SD)	16.16 (2.54)^a	16.20 (2.32)^a	16.38 (2.33)	16.80 (2.63)^b	<.001
Current weekly drinking	21.28^a	28.72^a	23.48^a	11.96^b	<.001
Current weekly heavy episodic drinking	8.94	13.74^a	10.43	5.96^b	<.001
>22 years old	27.54^a	34.35^a	42.91^b	53.53^c	<.001
Maternal education ≤ high school	40.68	35.49^a	43.48^b	47.19^b	<.001
Paternal education ≤ high school	42.37	36.93^a	49.13^b	54.46^b	<.001
Parental education data missing	19.49	17.30	14.78	20.79	.249
Currently in school	52.12^a,b	56.60^a	43.91^b	30.36^c	<.001
Currently employed full time	32.63^a	39.84^a,b	50.65^c	46.20^b,c	<.001
Live with parents	34.32^a	39.20^a	45.00	51.49^b	<.001
DSM-IV major depression	18.22^a	18.44^a	18.91^a	31.68^b	<.001
Current smoking	34.89	30.61^a	36.09	40.07⁶	.006
Ever had romantic relationship	91.67	94.95	94.25	90.86	.021
Current romantic relationship	65.53	66.30	61.52	57.67	.024
Married or cohabiting	30.21^a	28.03^a	34.13	43.05^b	<.001
Many friends	55.32^a	57.09^a	50.43	43.05^b	<.001
Majority of friends drink weekly	37.93	47.42^a	35.65^b	29.35^b	<.001
Majority of friends get drunk monthly	37.93	45.08^a	35.00^b	24.66^c	<.001
Childhood sexual abuse	14.41^a,b	10.23^a	14.57^b	24.09^c	<.001
Early menarche (<12 years)	7.73^a	14.96^b	25.00^c	28.81^c	<.001
Weight/shape concern	13.62^a	26.09^b	31.59^b,c	39.07^c	<.001
Blacks		(n = 217)^*	(n = 139)	(n = 139)
Ever had a drink	—	75.46	76.98	77.14	.922
Age at first drink, mean (SD)	—	17.63 (2.57)	17.42(2.51)	17.08 (3.20)	.235
Current weekly drinking	—	11.11	15.83	13.67	.439
Current weekly heavy episodic drinking	—	4.63	2.16	4.32	.547
>22 years	—	35.19^a	48.92	55.00^b	.003
Maternal education ≤ high school	—	31.02	37.41	36.43	.469
Paternal education ≤ high school	—	40.28	46.76	45.71	.493
Parental education data missing	—	36.11	32.37	39.29	.568
Currently in school	—	51.85^a	41.01	30.71	.001
Currently employed full time	—	33.49	41.01	41.73	.236
Live with parents	—	46.76	56.12	50.00	.285
DSM-IV major depression	—	21.30	28.06	32.86	.077
Current smoking	—	12.96	20.86	16.55	.174
Ever had romantic relationship	—	93.99	98.12	90.32	.038
Current romantic relationship	—	51.85	56.83	55.80	.608
Married or cohabiting	—	17.59	22.23	20.71	.546
Many friends	—	29.63	20.86	21.43	.145
Majority of friends drink weekly	—	22.07	28.57	26.12	.418
Majority of friends get drunk monthly	—	20.38	22.56	23.13	.807
Childhood sexual abuse	—	13.43^a	23.02^b	26.43^b	.008
Early menarche (<12 years)	—	23.61^a	33.33	39.86^b	.008
Weight/shape concern	—	22.22^a	36.69⁶	45.65^b	<.001

Notes: DSM-IV = Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition. Percentages with different superscripts differ significantly from one another (p ≤ .01).

This group includes 7 underweight women.