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. Author manuscript; available in PMC: 2008 Apr 30.
Published in final edited form as: Soc Sci Med. 2007 Mar 26;64(10):2152–2164. doi: 10.1016/j.socscimed.2007.02.003

Table 3.

Selected indicators of sexual risk by gender, Northern Plains American Indian young adults

Ever had sex N Total Males Females Prob
CHOICES Complete sample 510 82.6% (421) 86.0% (208) 79.5% (213) 0.054
19+ years old 257 92.2% (237) 93.2% (124) 91.1% (113) 0.529
<=18 years old 253 72.7% (184) 77.1% (84) 69.4% (100) 0.178
YRBS** 11th and 12th gr na 55.3% 54.7% 56.1% ns
Had sex before age 13, among those who had sex
CHOICES Complete sample 400 9.5% (38) 16.9% (34) 2.0% (4) 0.000
19+ years old 228 10.53% (24) 18.33% (22) .9% (1) 0.000
<=18 years old 172 8.1% (14) 15.0% (12) 2.2% (2) 0.000
YRBS 11th and 12th gr na 5.4% 7.1% 3.2% +
Used alcohol/drugs at last sex, among those who had sex
CHOICES Complete sample 412 26.5% (109) 35.1% (72) 17.9% (37) 0.000
19+ years old 233 26.2% (61) 35.8% (44) 15.5% (17) 0.000
<=18 years old 179 26.8% (48) 34.2% (28) 20.6% (20) 0.042
YRBS 11th and 12th gr na 23.2% 28.5% 17.7% +
Used condom at last sex, teenagers only, among those who had sex
CHOICES Complete sample 421 37.3% (157) 47.1% (98) 27.7% (59) 0.000
19+ years old 237 31.7% (75) 44.4% (55) 17.7% (20) 0.000
<=18 years old 184 44.6% (82) 51.2% (43) 39.0% (39) 0.097
YRBS 11th and 12th gr na 56.2% 63.0% 49.2% +
Had 4 or more sexual partners over lifetime, among those who had sex
CHOICES Complete sample 340 44.7% (152) 59.9% (94) 31.7% (58) 0.002
19+ years old 186 46.2% (86) 55.3% (52) 37.0% (34) 0.258
<=18 years old 154 42.9% (66) 66.7% (42) 26.4% (24) 0.000
YRBS 11th and 12th gr na 18.7% 19.0% 18.2% ns
Have been pregnant or have gotten someone else pregnant, among those who had sex
CHOICES Complete sample 400 38.5% (154) 26.4% (51) 49.8% (103) 0.000
19+ years old 225 49.5% (109) 31.9% (37) 66.1% (72) 0.000
<=18 years old 175 25.7% (45) 18.2% (14) 31.6% (31) 0.032
YRBS 11th and 12th gr na 7.7% 5.6% 10.0% +
*

CHOICES, wave 1 (1996). Percentages are based on column percents. Ns for each question vary due to missing data in self-administered survey. Statistical tests are based on chi-squared distributions of gender differences.

**

Youth Risk Behavior Survey (1997), 11th and 12th grade only. Percents adjusted and weighted. No specific N’s provided for each question; total sample N=16,226.

+

Significant gender difference, p<.05, based on published 95% confidence intervals.