 
<prompt> Mean number of months between marriage and first birth for ever-married women age 15-49 for the survey years 1990, 1997, 2002, 2007, 2009, and 2012, with 95% confidence intervals | (1990.0, 20.3) (1997.0, 21.5) (2002.0, 23.3) (2007.0, 28.3) (2009.0, 20.6) (2012.0, 22.3) <response> As shown in the figure, except for a significant jump in 2007 to a mean of 28.3 months, this mean has remained relatively unchanged, in a range from 20.3 to 23.3 months.  