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APPENDIX B Supplemental Data This appendix) presents a variety of data to supplement the discus- sion of sexual behavior in Chapter 2. Table B-1 summarizes data from several studies of the proportions of young men and young women reporting first sexual intercourse at (or before) various ages. These data span the period 1958-1973; it should be notes! that most of these studies used convenience samples drawn from particular high schools or colleges. Table B-2 presents parallel data (broken down by birth cohort) from a national probability sample of young women conducted in 1982 (the National Survey of Family Growth, or NSFG), and Table B-3 presents similar data collected by ZeInik and Kantner (1985) from probability samples of young women residing in metropolitan areas of the United States in 1971, 1976, and 1979. Table B-4 (adapted from work reported by Klassen and colleagues in this volume) provides a parallel tabulation from the 1970 Kinsey Institute survey broken down by birth cohort. Figures B-1 and B-2 plot the data from these tables.2 Table B-5 presents a tabulation of the number of sexual partners reported by never-married young women in the 1979 ZeInik and Kantner survey. Table B-6 compares measurements of heterosexual activity for the 1944-1949 birth cohort that were made in the 1982 NSFG and in the 1970 Kinsey Institute survey. Although a definitive iReferences cited in this appendix can be found in the Chapter 2 bibliography. 2To make the plots "readable," only the 1979 survey data from Zelnik and Kantner have been plotted. For the 1944-1949 cohort from a national probability sample, we have plotted only the 1970 Kinsey Institute survey data; a tabulation of data for women in this birth cohort in the NSFG can be found in Table B-6. The reader should note that the 1970 Kinsey Institute survey data reflect sexual contact to orgasm and not necessarily intercourse. 412

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APPENDIX B | 413 interpretation cannot be made, the higher rates of sexual activity reported in the 1970 Kinsey Institute survey may plausibly reflect the fact that the "activity" measured in that study was sexual contact to orgasm, whereas the NSFG measured reported intercourse. Tables B-7 and B-8 elaborate data reported by Fay and col- leagues (in press). Table B-7 cross-tabulates the homosexual ex- perience of ever-married men (including number of mate partners) by their premarital heterosexual experience. As noted in the com- mentary by Pay and coworkers (in press), although these data show substantial heterogeneity of same-gender and across-gencler sexual contacts, the data are quite sparse, and the missing data problems are severe. Table B-S provides a parallel tabulation for never-married men; however, owing to the paucity of available data (N = 135 never- married men), the table does not break down the men's same-gender sexual experience by number of same-gender partners.

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APPENDIX B ~ 421 80 70 60 50 IIJ co Z 40 C' G IL AL 30 20 Metropolitan Probability Sample, 1979 Colorado H.S. / Student ~ I/ /// // ~ // Michigan H.S.// / I// Nonstudents, Madison, V\fis., 1971 / at'l. Probability Sample, j Born 1944-1949 Univ. of V\fis. Students, 1971 Probability Sample, / U.S. College Students, 1967 - /Original Kinsey College Sample / (1938-1953) A. Women 13 14 15 16 17 18 19 20 21 22 23 24 AGE FIGURE B-1 Proportion of females reporting premarital sexual intercourse (by age) in selected studies. NOTE: In the 1970 Kinsey Institute survey, respondents reported sexual contact to orgasm of either partner (not intercourse). SOURCE: Tables B-1 to B-4.

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422 ~ APPENDIX B 80 70 60 50 40 30 20 10 O Nat'l. Probability Sample, Born 1944-1949 / / / / Michigan H.S./ Students - 1 1 1 1 1 1 1 1 1 Colorado H.S. Students, 1972 / / Nonstudents, Madison, \/~fis., 1971 ~ Univ. Of VVis. Students, 1971 Metropolitan Probability Sample, 1979 / Probability Sample, / U.S. College Students, 1967 - - - ~riginal Kinsey College Sample / (1938-1948) B. Men - 13 14 15 16 17 18 19 AGE 20 21 22 23 24 FIGURE B-2 Proportion of males reporting premarital sexual intercourse (by age) in selected studies. NOTE: In the 1970 Kinsey Institute survey, respondents reported sexual contact to orgasm of either partner (not intercourse). SOURCE: Tables B-1 to B-4.

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APPENDIX B ~ 423 TABLE B-5 Total Number of Heterosexual Partners Reported in the 1979 Kantner and Zelnik Survey by Never-Married Young Women Residing in Metropolitan Areasa Age Number of Sexual Partners 15 16 17 18 19 None 77.57 62.3% 51.5~o 43.3~o 31.2% 1 15.0 18.0 25.0 23.4 27.1 2 3.4 11.2 7.4 10.7 12.5 3 2.5 6.1 6.8 8.6 14.0 4 0.9 0.6 1.5 5.1 4.5 5 0.0 0.5 1.9 2.4 2.4 6 0.4 0.3 0.9 1.0 2.5 7-9 0.3 0.4 2.1 1.3 2.8 10 + 0.0 0.6 2.7 4.1 2.9 Total 100 % 100 % 100 % 100 % 100 % N 313 364 314 300 275 NOTE: Secondary analysis of data provided by the Data Archive on Adolescent Pregnancy and Pregnancy Prevention from the data set collected in 1979 by Zelnik and Kantner (1985). Percentages were tabulated using sampling weights encoded in the data set; Ns shown in last row of table are unweighted. Five cases were excluded from this analysis due to missing data. aThe survey sample was restricted to young women residing within the standard metropolitan statistical areas of the United States. TABLE B-6 Cumulative Percentage of Female Respondents Born Between 1944 and 1949 Reporting Premarital Sexual Contact to the Point of Orgasm in 1970 Kinsey Institute Survey and Cumulative Percentage Reporting Sexual Intercourse in 1982 National Survey of Family Growth (NSFG) Survey and Cohort Kinsey NSFG Age 1944-1949 1944-1949 Before 14 4.1% 2.1~o Before 15 7.3 3.6 Before 16 15.4 8.8 Before 17 26.4 16.6 Before 18 37.8 26.5 Before 19 50.0 36.6 Before 20 56.1 45.5 NOTE: Estimates from 1982 NSFG are weighted means of estimates for two birth cohorts (1944-1946 and 1947-1949) reported in Hof- ferth et al. (1987:49, Table 2). The sample Ns (479 and 664) for the cohorts were used as weights in estimating the percentages for the combined group (1944-1949). Almost identical results are obtained if the size of these cohorts in the 1980 census are used as the weights. SOURCE: Secondary analysis of 1970 Kinsey Institute Survey data and Hofferth et al. (1987).

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