The phrase "than did" is an acceptable phrase in written English.
It is used when making comparisons between two things, verbs, or actions. For example: "Jim studied harder last semester than did Jane."
Picture books exhibited much more originality than did teenage literature.
And Europeans found them funnier than did Americans.
An 8-weight rod more than did the job.
They departed more peacefully than did many club members.
PN and RDDI provided different results than did others.
Fresh cells appeared to respond better than did cryopreserved ones.
However, both performed significantly more poorly than did controls.
Older children reported greater headache frequency than did younger children.
Nongrazed wheat produced more yield than did grazed wheat (P = 0.04), and harvesting at soft dough produced more yield than did harvesting at anthesis (P < 0.001).
US participants provided street names more frequently than did Dutch participants, whereas Dutch participants provided landmarks more frequently than did US participants.
