Mean and median number of partners for kissing-only, sex-only and kissing-with-sex partners among 3677 men who have sex with men, stratified by age
| Age (years) | Mean (SD) number of partners | Ptrend* | Median (IQR) number of partners | Ptrend† |
| Kissing-only partner | ||||
| 16–24 | 5.07 (7.85) | <0.001 | 3 (1–6) | <0.001 |
| 25–34 | 4.68 (9.28) | 2 (0–5) | ||
| 35–44 | 3.97 (9.49) | 2 (0–5) | ||
| ≥45 | 2.41 (5.00) | 0 (0–3) | ||
| All | 4.33 (8.59) | – | 2 (0–5) | – |
| Sex-only partner | ||||
| 16–24 | 0.79 (2.04) | <0.001 | 0 (0–1) | <0.001 |
| 25–34 | 1.26 (3.17) | 0 (0–1) | ||
| 35–44 | 1.69 (4.13) | 0 (0–2) | ||
| ≥45 | 2.65 (8.07) | 1 (0–3) | ||
| All | 1.42 (4.22) | – | 0 (0–1) | – |
| Kissing-with-sex partner | ||||
| 16–24 | 4.25 (5.76) | 0.025 | 3 (2–5) | 0.812 |
| 25–34 | 5.27 (9.97) | 3 (2–5) | ||
| 35–44 | 5.64 (10.43) | 3 (2–6) | ||
| ≥45 | 4.74 (6.28) | 3 (1–5) | ||
| All | 5.04 (8.87) | – | 3 (2–5) | – |
*P for trend was calculated from negative binomial regression model.
†P for trend was calculated from Jonckheere-Terpstra test.
IQR, interquartile range; SD, standard deviation.