Your sense of alarm coming with the Data is shared.
I was not able to evaluate how the magnetude of coverage change
in PDO and PAXS could be calculated
My por boy sauce has added the recent special dividends may have
an effect on the taste.
I cannot see the path used to calculate such change per period
of time.

Best Rgds;
R..........My recent media readings all say Corporate bonds are
good to go for 2023. Along with Bonds in general.
based on FED reaching 5 - 5.25% Max, and a 4-4.25% sustained
for a certain projectable period .