A study on couples' retirement transitions found that women who took new jobs after retiring from their primary careers reported high marital satisfaction, more than when retiring completely.
more than when retiring
more than if they were to retire
more so than those who retired
which was more so than those retiring
which was more than if they had retired
Yes, it is. It is used in making a "more than" type of comparison where you also want to refer to a previously stated verb / action (that's where the "so" comes in). In this case, the "so" refers to "reported high marital satisfaction."
Notice here that you are comparing two groups of women: those who take new jobs, and those who retire completely. When making a comparison, you have to make sure you explicitly mention both groups.
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