The phrase "research studies indicated" is correct and usable in written English.
You can use it when referring to research studies that have provided evidence for something. For example: "Research studies indicated that using alternative energy sources could help reduce carbon emissions."
Over 70% of all the available peer-reviewed papers have been published in the past two years, with a current average of one paper published each day; 87% of original research studies indicate potential risks or adverse health outcomes; 95% indicate elevated concentrations of air pollutants, and 72% of water studies indicate potential or actual incidence of contamination.
However, research studies indicate that, for nurses, the person-centred care of older people with cognitive impairment is challenging.
Laboratory research studies indicate that aerosolized influenza viruses survive for longer periods at low relative humidity (RH) conditions.
Other research studies indicate that target base flipping and closure of the mobile catalytic loop occur simultaneously [ 17].
Inequity at the district level is likely to contribute to inequity at the individual level: research studies indicate that Indonesia has one of the least pro poor distributions of public health resources in the region [ 16].
Numerous research studies indicate that persistent organic pollutants [e.g., 1,1,1-trichloro-2- o-chlorophenyl -2,2 p-chlorophenyl)ethane (DDT), polychlorinated biphenyls (PCBs), and polybrominated diphenyl ethers] bioaccumulate in fat and are transferred to breast milk, thereby exposing breast-feeding infants (Landrigan et al. 2002).
Animal research studies indicate that Po accumulates in the reproductive and blood-forming organs and that some Po is probably transferred from the mother to the embryo and fetus where its high-energy alpha particles can potentially kill or damage critical cells.
The synthesis of practice conducted in this research study indicated that there was significant variability in terms of which products were used by the different DOTs and that there was very little consensus among the DOTs in terms of which concrete or steel bridge beam end treatments are the most promising.
The final conclusions drawn from this research study indicated that, when describing the interactive effect of an instructional strategy on the means which individuals think of what they see (the 'verbaliser-imager' continuum): 1. Verbalisers perform best when given an instructional format enhanced with graphical metaphors 2.
