The phrase "a surprisingly high frequency" is correct and usable in written English.
It can be used when discussing the occurrence of an event or phenomenon that is more common than expected.
Example: "The study revealed a surprisingly high frequency of sleep disturbances among the participants."
Alternatives: "an unexpectedly high rate" or "a notably high occurrence".
The finding of a surprisingly high frequency and high diversity of X haplogroup lineages, and the rejection of a recent bottleneck or founder effect, encouraged us to conduct a more detailed analysis of the distribution of the X haplogroup lineages according to geographic sub-regions.
Again, this is a surprisingly high frequency, which corroborated the phenotypic observations.
Our analyses detected a surprisingly high frequency of ACPA isotypes in symptom-free first-degree relatives.
However, oseltamivir has been linked to a surprisingly high frequency of drug-resistant strains in children [ 10].
FIDEL-related sequences were found to be expressed in both species studied with a surprisingly high frequency.
In contrast, a surprisingly high frequency of morphologically differentiated sex chromosomes occur in Notothenioidei, a perciform fish group endemic to Antarctic waters [ 14, 15].
The largest number of program-specific singleton deletion calls was made by HelixTree (Table 5), at a surprisingly higher frequency than Birdsuite, Partek and PennCNV-Affy, which tended to agree with each other.
Given the surprisingly high frequency of correspondence, we decided to investigate these possible degradative or re-modelling genes further by exploring both their evolutionary and functional relationships.
Although functional translocation of coding sequences from the mitochondrion to the nucleus has essentially ceased in animal mitochondria, these seemingly difficult events occur at surprisingly high frequency in flowering plants.
Given the surprisingly high frequency with which hotspot motifs are created (at least 0.17% per mutation), and that there are many intervening mitoses for each meiosis, the rate at which hotspots are created de novo by mutations might offset the rate at which they are lost through meiotic gene conversion.
Observations from numerous studies [4] [8], [44], [60] appear to lend strong support to this inference, and resequencing studies have recently begun to reveal surprisingly high frequencies of apparently-crippling mutations in natural plant populations [61].
