The phrase "and the sixth study" is correct and usable in written English.
It can be used when referring to a specific study in a series or list of studies, particularly in academic or research contexts.
Example: "The results were consistent across all studies, and the sixth study provided additional insights into the findings."
Alternatives: "as well as the sixth study" or "including the sixth study".
Nastech has completed two safety and efficacy studies in men, and the second study in women is currently under way, the company said.
Charbonneau was recognized for a long list of firsts, including the first observation of a transiting exoplanet and the first study of an exoplanet's atmosphere.
Results: During the first and the second study periods 204 and 244 patients were respectively admitted in the ICU.
The first study was performed in 18 different areas in five European countries and the second study in the city of Gothenburg in 14 different areas.
The first study compared the sentencing decisions of male and female judges, and the second study addressed the evaluation of female faculty members' perceptions of and response to plagiarism.
The first study employed 0.8 ng/kg LPS in a within-subject design of 8 individuals (1 woman), and the second study 0.6 ng/kg LPS in a between-subject design of 52 participants (29 women).
The first round in 2011 was major news across the country and the first study that compared physician burnout rates to those of non-physician workers.
The two differences: the second study looked at the effects six months later instead of only one week later; and the second study used a more sophisticated type of assessment of the students' learning.
Three of the four studies involved mock negotiations with MBA students enrolled in a negotiation course at Columbia Business School, and the fourth study was an online survey of 500 US adults.
The only difference between samples of the first study and the second study half is the time of storage at −80°C 14-111 years versus 9-8 years).
