Figure 1.

Percentages of those reporting 2+ UAI partners within the previous 12 months over time and by age group (<25 years and ≥25 years).

Notes: 2+ UAI partners=2 or more unprotected anal intercourse partners within previous 12 months. Key to surveys (year, funder, location, n).

1996: MRC, Edinburgh/Glasgow, n=2184.

1999: MRC, Edinburgh/Glasgow, n=2244.

2000: Healthy Gay Scotland, Edinburgh/Glasgow, n=713.

2002/3 (total n=2106): 2002a) MRC, Edinburgh/Glasgow, n=1573; 2002b) Gay Men's Health, Edinburgh, n=276; 2003, Gay Men's Health, Edinburgh, n=257.

2005: MRC, Edinburgh/Glasgow, n=1646.

2008: MRC, Edinburgh/Glasgow, n=1330. Odds ratios adjusted for age group (AOR) of 2+ UAI partners for consecutive surveys (i.e., comparing each survey with previous survey);

1996–1999: AOR 0.93, 95% CI 0.75 to 1.15, p=0.498.

1999–2000: AOR 0.98, 95% CI 0.73 to 1.32, p=0.897.

2000–2002/3: AOR 1.68, 95% CI 1.26 to 2.23, p<0.001.

2002/3–2005: AOR 1.05, 95% CI 0.87 to 1.26, p=0.628.

2005–2008: AOR 1.06, 95% CI 0.86 to 1.32, p=0.567.