The phrase "a study documented that" is correct and usable in written English.
It can be used when referring to research findings or evidence presented in a study.
Example: "A study documented that regular exercise significantly improves mental health."
Alternatives: "research indicated that" or "a study found that".
Although a study documented that 12 interviews are sufficient for data saturation [ 16], another study have suggested 17 interviews as sufficient [ 17].
In India, such a study documented that one third of women delivered at other than their planned place of delivery [ 24].
On this issue, a study documented that statin therapy after an acute myocardial infarction is associated with reduced rates of all-cause and cardiac mortality, but the degree of risk reduction is lower for women than for men (31).
Recently, a study documented that a four-fold increase of the fox population in Switzerland resulted in a statistically significant increase of the annual incidence of AE cases [ 1] (Schweiger et al., 2007).
Although most previous studies had not mentioned total protein or albumin levels, a study documented that current or past coffee consumption and smoking lower serum albumin, globulin, and all other protein fractions [ 15].
In January 2015, the National Transportation Safety Board published a study documenting that gas accidents in "high-consequence" areas (where there are a lot of people and buildings) have been on the rise.
A previous study documented that participating scientists use an array of mentoring techniques including socializing students into science, modeling scientific thinking, and combining content and practices naturally (Adams & Hemingway, 2014).
A recent study documented that more than one-third of incoming California prisoners were infected with hepatitis B. Despite the need, most prisoners still lack widespread access to vaccinations.
For example, a 2015 study documented that members of the U.S. Senate who sit in close proximity are more likely to support one another's legislation, regardless of party affiliation.
A Commonwealth Fund study documented that the U.S. ranks last among 11 developed countries on the quality of our health system, including shorter life spans than comparable countries.
Indeed, a recent study documented that odor preferences and oviposition behavior are greatly influenced by specific OBPs in Drosophila [34].
