What does it mean when a MoM value falls outside the 95% confidence interval around 1.0 MoM?

The 95% confidence interval is the range of values within which one can be 95% certain that the true value occurs. If the same trial were repeated 100 times, in 95 trials the confidence interval would include the true value, and in 5 trials it would not.

When a MoM value falls outside the 95% confidence interval around 1.0 MoM it may indicate that the current estimates of the gestation-specific medians are not accurate, and therefore need revising.

When a MoM value falls outside the 95% confidence interval, Alpha will show this on marker tabulations (using asterisks) or graphs of monthly medians (using a red circle instead of black).