The phrase "an almost invariable" is correct and usable in written English.
It can be used to describe something that is nearly always the same or consistent, with very few exceptions.
Example: "The results of the experiment showed an almost invariable pattern, indicating a strong correlation between the variables."
Alternatives: "a nearly constant" or "a consistently similar".
It is an almost invariable rule that the more historians study Henry VIII, the less they like him.
Distinguished visitors to Manchester have, as an almost invariable rule been taken to see the mills as part of the lions of this busy, manufacturing district.
Gambling with dice was popular with the Greek upper classes, and was an almost invariable accompaniment to the symposium or drinking banquet.
Because sanderlings have an almost invariable clutch size of four eggs [28], pairs that raise two clutches would thus have the potential advantage of a twice as large annual reproductive output.
Background Transcultural studies have found lack of insight to be an almost invariable feature of acute and chronic schizophrenia, but its influence on prognosis is unclear.
Transcultural studies of schizophrenia conducted under the auspices of the World Health Organization found that lack of insight was an almost invariable feature of acute and chronic schizophrenia, regardless of setting. 1, 2 A categorical or unidimensional view of insight has given way to more multidimensional perspectives, 3 which appear to be adaptable to different cultural settings.
Between 15 and 60 °C the populations of states A and B are almost invariable at pA=0.75.
Table 1 shows the effect (OR) of passive smoking on CAP for the overall study sample and for the age subgroups, with a significant effect only in participants aged 65 years or more, with an OR that remained almost invariable after adjusting by age and sex.
With the increase in temperature difference, the optimal N increases at smaller currents of I ≤ 1.0 A, however, it is almost invariable at larger currents of I ≥ 1.5 A.
Position 3, which almost invariably harbors a hydrophobic leucine (L), was also found almost invariable in the orthologs of the confirmed exported P. falciparum proteins.
The main reason why time to event data provide a greater challenge is the almost invariable censoring of some observation times, caused by some patients' outcomes remaining unascertained within the study period.
