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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: Soc Sci Res. 2013 Mar 22;42(5):1402–1409. doi: 10.1016/j.ssresearch.2013.03.004

Table 2.

Differences in Provided a Sample by Key Study Measures and Sociodemographic and Study Participation Characteristics of Respondents (N=150)

Total (N=150) Did not provide a sample (N=53) Provided a sample (N=97) Chi-Sq (df) P-value
Key Study Measures
Lifetime number of sexual partners 2 or more .79 .77 .79 .0836 .773
Ever had sex without birth control .63 .66 .61 .3981 .528
Ever pregnant .27 .23 .29 .6790 .410
Sociodemographic Characteristics
African American .36 .38 .35 .1072 .743
High school or less education .59 .53 .63 1.437 .231
Enrolled in school .75 .72 .76 .3818 .537
Married, engaged, or living with partner .15 .13 .15 .1394 .709
Biological mother <20 years old at 1st birth .33 .36 .31 .3774 .539
Receiving public assistance .28 .17 .34 4.936 .026
Study Participation Characteristics
Below average proportion of journals completed .39 .60 .27 16.29 .000
Express mail delivery .57 .68 .51 4.230 .040

Note: Bold numbers indicate a statistically significant difference (p<0.05) between proportions of sample women who did not and did provide a sample, two-sided tests.