Table 1.

Characteristics of the study population: African-American adolescents (n = 1,619)

Characteristic	na	Weighted frequency	Weighted percentage (SD)b	χ2 (df)c	P-value
Age-group				739.62 (2)	<0.0001
10–13 years	72	120,849	3.31 (0.47)
14–17 years	1,028	2,256,803	61.8 (1.32)
18 years and above	519	1,274,348	34.89 (1.25)
Biological mother				1,078.46 (2)	<0.0001
Not known	26	74,572	2.05 (0.46)
Known	203	551,897	15.15 (1.15)
Living with biological mother	1,388	3,016,506	82.8 (1.21)
Biological father				257.81 (2)	<0.0001
Not known	194	501,515	13.79 (1.10)
Known	819	1,957,921	53.85 (1.53)
Living with biological father	602	1,176,562	32.36 (1.35)
Sex				0.02 (1)	00.8797
Female	846	1,817,501	49.77 (1.54)
Male	773	1,834,499	50.23 (1.54)
Sexual orientation				983.55 (1)	<0.0001
Majority (heterosexuality)	1,583	3,560,170	97.49 (0.47)
Minority (homosexuality or bisexuality)	36	91,830	2.51 (0.47)
Age at first sex				404.24 (3)	<0.0001
<10 years	153	372,725	10.21 (0.93)
10–15 years	510	1,262,493	34.57 (1.44)
16–20 years	176	393,246	10.77 (0.89)
Never had sexual intercourse	780	1,623,537	44.46 (1.44)
HIV infection				1,052.28 (1)	<0.0001
No infection	1,615	3,641,058	99.81 (0.13)
Infected	2	6,860	0.19 (0.13)
HIV test				599.49 (1)	<0.0001
Test	141	366,360	10.08 (0.98)
Never tested	1,474	3,269,809	89.92 (0.98)
Birth control during first sex				457.40 (3)	<0.0001
Never had sexual intercourse	780	1,623,537	44.67 (1.44)
Condom	536	1,223,387	33.66 (1.41)
Other birth control	16	44,572	1.23 (0.33)
None	282	743,101	20.45 (1.29)
Birth control during recent sex				386.43 (3)	<0.0001
Never had sexual intercourse	780	1,623,537	45.04 (1.45)
Condom	518	1,184,020	32.85 (1.42)
Other birth control	41	113,044	3.14 (0.59)
None	261	683,805	18.97 (1.26)
Frequency of condom use				1,053.35 (4)	<0.0001
Never had sexual intercourse	780	1,623,537	44.46 (1.44)
Most of the time	32	94,968	2.6 (0.57)
Half of the time	48	126,201	3.46 (0.55)
Some of the time	41	121,078	3.32 (0.57)
None of the time	718	1,686,214	46.17 (1.47)
Having sex in exchange for drugs/money				919.76 (1)	<0.0001
No	1,582	3,543,241	98.09 (0.43)
Yes	25	69,171	1.91 (0.43)
Frequency attending religious service				249.61 (3)	<0.0001
Once a week or more	803	1,613,945	44.38 (1.46)
Once a month or more	357	824,134	22.66 (1.25)
Less than once a month	178	427,797	11.76 (0.97)
Never	277	771,123	21.2 (1.28)
Importance of religion				443.17 (1)	<0.0001
Important	1,390	3,029,199	83.24 (1.18)
Not important	225	609,805	16.76 (1.18)
Gone to religious service with mother				348.73 (2)	<0.0001
No mother	77	223,632	6.15 (0.81)
No	779	1,852,535	50.94 (1.48)
Yes	757	1,560,771	42.91 (1.42)
Gone to religious service with father				294.67 (2)	<0.0001
No father	822	2,031,395	55.74 (1.48)
No	490	1,047,520	28.74 (1.37)
Yes	303	565,356	15.51 (1.02)
Number of sexually transmitted diseases				947.02 (3)	<0.0001
More than one	20	47,712	1.31 (0.31)
One	62	157,312	4.31 (0.61)
None	756	1,822,171	49.91 (1.49)
Never had sexual intercourse	780	1,623,537	44.47 (1.44)

Notes:

^aWithin variable, variation is associated with missing records and/or no response;

^bsome percentages may not add up exactly to 100%, due to rounding;

^cχ² statistics based on the Rao–Scott modified test, which provides a design-based goodness-of-fit test using survey weights.

Abbreviation: SD, standardized deviation.