Table 2.
Age of Initiation of Oral Sex with a Man by Birth Cohort of MSM Participants in the American Men’s Internet Survey, United States, 2015
| Birth Cohort | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| All | 1950–1969 | 1970–1979 | 1980–1989 | 1990–2000 | ||||||
| (N=8,331) | (N=2,164) | (N=1,085) | (N=2,038) | (N=3,044) | ||||||
| Had oral sex by age xa | No. | (%) | No. | (%) | No. | (%) | No. | (%) | No. | (%) |
| 10 | 156 | (1.9) | 76 | (3.5) | 20 | (1.8) | 33 | (1.6) | 27 | (0.9) |
| 11 | 321 | (3.9) | 140 | (6.5) | 46 | (4.2) | 70 | (3.4) | 65 | (2.1) |
| 12 | 873 | (10.5) | 346 | (16.0) | 125 | (11.5) | 194 | (9.5) | 208 | (6.8) |
| 13 | 1436 | (17.2) | 525 | (24.3) | 191 | (17.6) | 317 | (15.6) | 403 | (13.2) |
| 14 | 2118 | (25.4) | 694 | (32.1) | 284 | (26.2) | 476 | (23.4) | 664 | (21.8) |
| 15 | 2837 | (34.1) | 872 | (40.3) | 357 | (32.9) | 638 | (31.3) | 970 | (31.9) |
| 16 | 3734 | (44.8) | 1046 | (48.3) | 441 | (40.6) | 849 | (41.7) | 1398 | (45.9) |
| 17 | 4451 | (53.4) | 1158 | (53.5) | 502 | (46.3) | 1041 | (51.1) | 1750 | (57.5) |
| 18 | 5486 | (65.9) | 1321 | (61.0) | 601 | (55.4) | 1284 | (63.0) | 2280 | (74.9) |
| 19 | 6149 | (73.8) | 1433 | (66.2) | 679 | (62.6) | 1459 | (71.6) | 2578 | (84.7) |
| 20 | 6605 | (79.3) | 1515 | (70.0) | 743 | (68.5) | 1568 | (76.9) | 2779 | (91.3) |
| 21 | 7036 | (84.5) | 1624 | (75.0) | 808 | (74.5) | 1700 | (83.4) | 2904 | (95.4) |
| 22 | 7298 | (87.6) | 1689 | (78.0) | 863 | (79.5) | 1780 | (87.3) | 2966 | (97.4) |
| 23 | 7481 | (89.8) | 1731 | (80.0) | 901 | (83.0) | 1847 | (90.6) | 3002 | (98.6) |
| 24 | 7612 | (91.4) | 1760 | (81.3) | 925 | (85.3) | 1898 | (93.1) | 3029 | (99.5) |
| 25 | 7728 | (92.8) | 1800 | (83.2) | 953 | (87.8) | 1938 | (95.1) | 3037 | (99.8) |
| Log-rank p-valueb | <0.001 | <0. 001 | <0.001 | ref | ||||||
| Mean [SD] age of first oral sex | 18.0 [5.7] | 19.4 [8.8] | 18.9 [6.07] | 17.7 [4.14] | 16.8 [2.8] | |||||
| Rank-sum p-valuec | <0.001 | <0.001 | <0.001 | ref | ||||||
a
Number and percentages are cumulative. For example by 18 years of age, 5,486 (65.9%) total parti cipants ever had oral sex with a male partner.
b
Log-rank p-value comparing equality of survival until first oral sex of one birth cohort to referent group of those MSM born 1990–2000.
c
Rank-sum p-value by Wilcoxon two-sample test comparing mean age of first oral sex of one birth cohort to referent group of those MSM born 1990–2000.