The phrase "a controlled study on" is correct and usable in written English.
It can be used when referring to a research study that is designed to test a hypothesis under controlled conditions.
Example: "The researchers conducted a controlled study on the effects of the new medication on patients with chronic pain."
Alternatives: "a controlled experiment regarding" or "a regulated study about".
To the best of our knowledge, this retention interval is the longest applied in a controlled study on olfactory forgetting.
A controlled study on 30 patients with early pSS using two infusions of rituximab (1 g) showed a significant increase in stimulated and unstimulated salivary flow.
Additionally, a controlled study on physical exercises supported by music for moderate to severe dementia patients found improvements in overall cognition, especially information processing and recall [ 15].
The results of this study call for definitive studies to definitively determine the effectiveness and costs of this intervention in a controlled study on a wider scale.
In a controlled study on a student sample, subclinical OC symptoms were observed to be significantly reduced after a mindfulness training [ 29].
Dass and colleagues performed a controlled study on 17 pSS patients with rituximab (1 g twice, 2 weeks apart) and noted a significant decrease in fatigue persisting for at least 6 months [ 39].
It is unlikely to ever be answered conclusively, because of ethical constraints on performing a controlled study of two groups randomised to 1CU admission or no ICU admission.
We undertook a controlled study of the effect of irradiation on the collagen production of fibroblasts cultured from skin biopsies taken from patients undergoing radiotherapy treatment.
A controlled study based on hundreds of college students compared people who identified themselves as "activists" with those who did not.
The purpose of the study was to examine the effectiveness of an intervention for parents of children with disabilities in a controlled study focusing on parents' self-efficacy, psychological well-being and perceptions of change in children's sleeping, eating and mobility.
This cost utility analysis was based on a randomized controlled study on the effects of a visiting service for older widowed individuals.
