The phrase "a time when levels" is correct and usable in written English.
It can be used to refer to a specific period during which certain levels of something were observed or experienced.
Example: "The study focused on a time when levels of pollution were at their highest in the city."
Alternatives: "a period when levels" or "an era when levels".
At a time when levels of cost-sharing are increasing among privately insured individuals, consideration should be given the potential impact of such changes on the treatment of individuals requiring specialty SA treatment.
Roy Ballam, education programme manager at BNF called for a national framework and guidance for food and nutrition education across the UK, "especially at a time when levels of childhood obesity are soaring".
At a time when levels of conflict and emotional distress were at their highest, participants often discussed reaching a point of acceptance towards their symptoms.
This is a time when levels of distress are high [ 1, 4] and formal follow up care and support is often lacking [ 3, 13, 16].
Another important factor may be the difference in age between tumor and normal samples; eight of the normal samples were derived from premenopausal women, between the ages of 19 and 35, a time when levels of steroid hormones and enzymes vary markedly during the menstrual cycle.
Instead, NHS dental service provision has developed historically, with levels of future service provision being determined by past levels of activity, at a time when disease levels at a population level are reducing [ 8].
The first finger stage is around 15 18 hours of development at a time when the levels of cyclin C are seen to be reduced compared to growing cells (Figure 2A).
Put simply, monetary union created a common interest rate at a time when inflation levels varied markedly.
There was even a time when oxygen levels were so high that they were toxic to much of life as it then existed.
It is hard to remember a time when valuation levels were harder to determine, simply because earnings numbers are now in doubt.
That is because it lived more than 100m years before the other giant arthropods, at a time when oxygen levels were slightly lower than they are today.
