The phrase "a certain month and" is correct and usable in written English.
It can be used when referring to an unspecified month in a context where the specific month is not important or is to be determined later.
Example: "We will schedule the meeting for a certain month and notify everyone in advance."
Alternatives: "an unspecified month" or "a particular month".
If company history is any indication, Apple tends to designate a certain month that it releases a product and then sticks to it.
Now, there have only been two iPads released thus far, so it might be too early to declare that there is a certain Month of the iPad; however, both the first iPad and the iPad 2 were early spring releases, with the original iPad going on sale in April 2010 (after missing a targeted March launch date) and the iPad 2 hitting shelves in March 2011.
For studies in which an intervention took place during a certain month, the prior month(s) were included as pre-intervention and following month(s) as post-intervention, but the actual month of intervention was excluded from these periods.
It can happen that most of the data in a certain month are obtained when the satellite is under a high-temperature condition, and monthly averaging cannot work for minimizing the temperature effect.
What you spend might vary wildly, depending on whether you drink at home or at a bar or restaurant, whether your social calendar is packed in a certain month, whether a special occasion ratchets up your purchases.
For example, a patient who is registered as inpatient in a certain month may be registered as outpatient in the next month, but never at the same month.
Seasonality of birth was assessed by modelling the number of cases born in a certain month compared to the total monthly birth population at risk using logistic regression with the inclusion of harmonic curves of 12 and 6 month periods.
This result is difficult to interpret since it means that antimicrobial drug exposure of some patients on a certain month has an impact on MRSA infections in other patients several months later.
For example, an increase in macrolide use by 10 DDD per 1,000 patient-days on a certain month, or 30 more patients treated with a macrolide as compared with the previous month, would lead to a direct increase in %MRSA by 0.83, 1 month later, by 0.55, 2 months later and by 0.27, 3 months later.
