The phrase "a poor control" is correct and usable in written English.
It can be used in contexts where you are discussing the effectiveness or quality of a control mechanism, system, or process, indicating that it is inadequate or insufficient.
Example: "The experiment yielded unreliable results due to a poor control in the testing environment."
Alternatives: "an inadequate control" or "a weak control".
Simulation results reveal fuel flow as a poor control variable because excessive tail-gas combustor temperatures limit fuel flow to below 110% of the baseline flowrate.
Conventional ablation electrodes, which are powered with radio frequency energy (RFE) provide only a poor control of destroyed tissue (lesion) depth and direction due to inhomogeneous thermal and electrical tissue properties.
This paper presents field test results for buildings that had the following problems: (1) chiller failure and a poor control strategy, (2) poor design of ventilating and air-conditioning equipment, and (3) improper operation of equipment following a change in the electrical panel.
In general, the gameplay was favourably reviewed, with critics praising the solid, enjoyable missions, though there were complaints regarding a poor control system and unfairly high levels of difficulty.
The mechanism by which HIV increases the risk associated with HPV infection may be linked to the immunodeficiency induced by HIV with a poor control of HPV infection [45].
Overall, a poor control of cardiovascular risk factors was noted.
Diabetic patients with HFNEF received less heart failure medication and showed a poorer control of blood pressure as compared to diabetic patients with SHF.
We have recently reported that diabetic subjects with PVD have a poorer control of modifiable risk factors than diabetic subjects with other clinical manifestations of cardiovascular disease [ 21].
Two glycemic control classes were identified: a poorer control class with higher means (all >7%) and higher within-subject variability in HbA1c and a better control class with lower means (all <7%) and lower within-subject variability.
An overall score is calculated by adding the score from each item with total scores ranging from 0 to 40, higher scores indicating a more severe health status impairment or a poorer control of COPD [ 16].
25 Another explanation could be a poorer control of diabetes in patients with lower socioeconomic background we have previously shown that missed appointments in the diabetes retinal screening programme is associated with younger patients living in more deprived areas.
