(IMAGE) MELISA Institute Caption Using a statistical technique called interrupted time series (ITS), the researchers identified a sustained decline in the maternal mortality ratio (MMR) from 1980 to 2009 (blue dots), the year of the H1N1 pandemic. During this event, the MMR increased exponentially (red point) and then resumed an even more accelerated downward trend from 2010 (celestial points). Credit MELISA Institute Usage Restrictions Use with the same caption and credits to MELISA Institute. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.