The phrase "alarmingly high proportion of" is correct and usable in written English.
It can be used when discussing statistics or data that indicate a concerning or unexpected level of something, often in a negative context.
Example: "The study revealed an alarmingly high proportion of students failing the math exam."
Alternatives: "worryingly large percentage of" or "concerningly high amount of".
An alarmingly high proportion of Union business was hanging fire on a German election result.
An alarmingly high proportion of the Australian adult population does not meet the National Physical Activity (PA) recommendations.
More than 60 have been suspended or sacked over various offences this year.An alarmingly high proportion of Jamaica's shootings are by the police themselves.
I had a tortuous experience over new statistics due for publication appearing to show foreigners had taken an alarmingly high proportion of the 3m new jobs created since we had been in power.
Investment in research from business is significantly lower in the UK than in many of our competitors and an alarmingly high proportion of that investment is from foreign-controlled companies (think Pfizer).
What we do know is that people are living increasingly fast-paced lifestyles, which are likely to contribute to the alarmingly high proportion of drivers now admitting to eating at the wheel".
Moreover, alarmingly high proportions of unemployed young people have been out of work for more than six months.
Moreover, alarmingly higher proportions of abortions (50%) were performed or initiated under unsafe circumstances and three fourths of those who had abortion suffered one or more complications.
To some of us, that remains an alarmingly high proportion.
A lot of the party's MPs were shocked by the poll suggesting that only half of voters identifying with Labour knew which side the party was on and an alarmingly high proportion thought Labour backed Out.
Although limited by small sample sizes, findings by Lloyd and Musser [ 16], Henning et al. [ 2] and Naidu et al. [ 17] showed that alarmingly high proportions 30-500%) of dental students may be in the clinical range of psychological disturbance.
