The phrase "and duration of certain" is not complete on its own, but it can be correct and usable in written English when placed in a proper context.
You can use it when discussing timeframes or lengths associated with specific events, activities, or conditions.
Example: "The report outlines the frequency and duration of certain activities that impact productivity."
Alternatives: "and length of specific" or "and time span of particular".
We expected the frequency and duration of certain behaviors (e.g. shaking, preening, vigilance) to vary in accordance with the degree of stress (as reflected in HR) elicited by a specific encounter.
In sum, our results show for the first time in non-human animals that the frequency and duration of certain post-conflict self-directed behaviors (shaking, autopreening) are correlated with autonomic arousal following an agonistic encounter and therefore may provide useful measures for estimating how an individual perceives a stressful event.
Anthropogenic nutrient loading from sources such as agriculture, fossil fuel emissions, and climate events is believed to be related to the global increase in frequency, size, and duration of certain algal blooms.
This locomotion test, by which mice were placed in a new surrounding, strongly correlates with the open field-tests performed to study incidence and duration of certain behaviors [ 15].
OR increases exponentially with the decrease of CD4 count (max. 37.68), total ART duration (max. 17.7) and duration of a certain regimen (max. 62.37) and linearly with the HIV-RNA level (max. 47.75).
Retrospective study (January 1990 January 201111): we have stratified data (CD4 count, HIV-RNA level, total duration of antiretroviral treatment (ART) and duration of a certain ART regimen) from 98 Px diagnosed with neurological sufferances.
CD4 count, HIV-RNA level, total ART duration and duration of a certain ART regimen could be used to predict the occurrence of neurological sufferances in Romanian HIV infected Px, however the best results (given the ROC sensitivity and specificity) are provided by the duration of a specific ART regimen.
Despite the success of infant vaccinations, periods of low vaccination coverage and the limited immunogenicity and duration of protection of certain vaccines have resulted in sporadic outbreaks, allowing some diseases to spread in communities.
Keynes discovered a third possibility that, he argued, was responsible for the depth and duration of severe depressions: under certain conditions, some prices may show no tendency to change even though desires to buy and to sell do not coincide in the respective markets and even though no institutional reasons exist for the prices to be rigid.
The safety of the method seems to be good, and there is probably no increase in complication rates, but a longer duration of certain symptoms in some studies [ 11].
In this manner, the control system designed engages the actuators that are better suited to efficiently perform spatiotemporal disturbance compensation over the duration of certain time intervals.
