The phrase "a lower proportion than" is correct and usable in written English.
It can be used when comparing the size or amount of one group to another, indicating that one group has a smaller percentage or fraction.
Example: "In the recent survey, the respondents from the younger demographic showed a lower proportion than those from the older demographic."
Alternatives: "a smaller percentage than" or "a reduced share compared to".
About 10% of Britons have private health insurance, a lower proportion than in many other European countries, and some others pay for their own treatment privately.
In 2014, the most recent census, it was just 26.2% – a lower proportion than those who considered themselves Hispanic or Latino, and roughly on a par with the borough's Asian population, which stood at 25.8%.
This summer only 6.9% taking French, German and Spanish achieved A*, a lower proportion than other subjects, prompting a major inquiry into how modern language A-levels are marked.
Fifty-one people were seized in Austin, fewer than half of whom were criminals — a lower proportion than in any other city in the country — leading residents to believe that the city had been singled out.
In a report in September the King's Centre for Military Health Research found that 3-5% of those coming back from Iraq and Afghanistan were suffering from PTSD (a lower proportion than among American troops, who tend to deploy for longer).
Only a fifth of professionals working with patents surveyed by Thomson Reuters believed that Chinese patents were of high quality, a lower proportion than in any other region in the study.Yet despite all this, it is clear that China really is growing more innovative.
Of the 266 eyes belonging to patients who died during the study period, 23 (8.6%) had received a capsulotomy, a clearly lower proportion than in the population still alive 5 years after cataract operation where 193 of 634 eyes (30%) received treatment.
The report finds that in sectors such as engineering, women make up a lower proportion of apprentices than a decade ago – for every female apprentice working within engineering there are 25 male apprentices.
A greater proportion of breast cancer cases than controls were currently using EPT at baseline; a lower proportion of cases than controls had high parity.
Cows fed 21% forage NDF had a higher proportion of acetate and a lower proportion of propionate than cows fed 17% forage NDF.
All the empirical evidence suggests that the rich tend to consume a lower proportion of income than middle and lower-income people.
