The phrase "ascertained it was" is correct and usable in written English.
You can use it when you want to express that you have determined or discovered something to be true or accurate.
Example: "After reviewing the evidence, I ascertained it was indeed the correct decision to make."
Alternatives: "determined it was" or "found it was".
When it got down to the last 15 minutes, it was down to two teams, and I let the previously high team know that it had topping rights, after the topping team ascertained it was its final offer.
"I ascertained it wasn't a story about satanism and it wasn't a story about evil, which was very important to me because, purely on a practical level, I didn't feel like going home and finding all the doors banging and shutting when I was lying in bed, or waking up with a gothic demon sitting on my chest.
A senior State Department official said Washington had not yet ascertained it was sarin.
Having ascertained it was an English ship, the Shenandoah left it alone.
When the identity of the p75NTR-ir profile could not be ascertained, it was categorized as unknown.
Because a complete cohort of the grower's employees could not be ascertained, it was not possible to fully characterize their birth defect risk.
If ancestral and genetic subgroups can be ascertained, it is also important for genetic association studies taking place in that region because typical self-reported race data may not adequately control for substructure confounding.
Particularly, because the denominator data (numbers of travellers) cannot be ascertained, it is not possible to calculate incidence rates.
Non-responders were more likely to be known to be working in a Pacific Island state, and for the 16 where location could not be ascertained, it is plausible that a disproportionate number might have resided outside New Zealand.
Genetic mapping also can be carried out directly in rodent models, and when similar phenotypes are ascertained, it is highly likely that the biological processes that lead to a disease will be shared between humans and mice.
While their functional significance is yet to be ascertained, it is interesting to note that several are antisense to ORFs with predicted functions related to those summarised in Fig. 4 (Table 4).
