"significant improvement from" is correct and usable in written English.
You can use it when referring to a notable improvement or advancement from a previous time or state to a newer or better one. For example: "The company saw a significant improvement from last year's sales figures."
What I did discover was perhaps not fundamental but nevertheless important: patients can experience significant improvement from non-specific effects.
It's a significant improvement from 2007, when the university received a "fail" grade in the degree-style rankings.
They are forecasting growth of 3.1% for the entire year, a significant improvement from the 2.4% growth seen in 2014.
There is little to suggest significant improvement from there, an I.D.C. analyst said.
This article was amended on 17 October to correct a statistic that said 80% of students showed significant improvement from attending university counselling services across UK higher education.
Those results are a significant improvement from Merck's 2003 pipeline, though only a fraction of Phase I and II drugs are ever approved for sale.
That is down from the peak in July 2007, but a significant improvement from last month, when the market for such financing virtually froze up.
The school had low test scores, but I advised the principal that the school had statistically significant improvement from the previous year's results.
The Lakers ranked fourth in opponents' field-goal percentage, holding teams to.435 shooting — a significant improvement from last year's.445.445
The reading was also a significant improvement from the preliminary figure of 49.1 that the bank published last week.
That would be a significant improvement from the current iPad, which has a 1,024-by-768-pixel display.
