Characterizing trends in HIV infection among men who have sex with men in Australia by birth cohorts: results from a modified back-projection method

Table 1 Summary of age at infection and age at diagnosis by calendar year

	Mean age
Calendar year	At infection (back calculation) age ± se ¹	At diagnosis (observed) age ± se ¹
1985	31.21 ± 0.17	32.31 ± 0.65
1986	29.80 ± 0.18	32.44 ± 0.68
1987	29.64 ± 0.19	33.86 ± 0.20
1988	29.29 ± 0.22	34.61 ± 0.24
1989	28.34 ± 0.24	34.43 ± 0.25
1990	27.42 ± 0.26	34.03 ± 0.28
1991	27.11 ± 0.28	34.41 ± 0.28
1992	27.23 ± 0.29	35.58 ± 0.32
1993	27.67 ± 0.30	34.65 ± 0.34
1994	28.59 ± 0.31	35.49 ± 0.36
1995	29.92 ± 0.31	36.00 ± 0.37
1996	31.51 ± 0.31	36.19 ± 0.38
1997	33.10 ± 0.32	37.00 ± 0.41
1998	34.12 ± 0.31	37.60 ± 0.46
1999	34.68 ± 0.30	36.90 ± 0.45
2000	35.10 ± 0.29	37.37 ± 0.43
2001	35.72 ± 0.27	36.77 ± 0.42
2002	36.57 ± 0.26	37.61 ± 0.41
2003	37.19 ± 0.25	38.54 ± 0.42
2004	37.39 ± 0.25	38.15 ± 0.40
2005	37.50 ± 0.23	38.52 ± 0.40
2006	37.72 ± 0.19	38.77 ± 0.39
2007	37.81 ± 0.27	38.53 ± 0.38