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Unexplained infertility: no treatment Live birth rate 100% 80% 60% 40% 20% 0 1 yr 3-5 yrs 5 yrs months Duration of infertility Hull et al, 1985 6 12 18 24 Author Collins et al. 1995 Snick et al. 1997 Setting Tertiary Care Primary care Live birth at 3 years 33% 60% years 32.5 32 31.5 31 30.5 30 29.5 29 28.5 28 27.5 27 Female age at attendance Maheshwari et al, Hum. Reprod. 2008 16 13 yr1989 yr1990 yr1991 yr1992 yr1993 yr1994 yr1995 yr1996 yr1997 yr1998 yr1999 yr2000 yr2001 yr2002 yr2003 yr2004 yr2005 yr2006