four-year study vs four years study

The correct phrase is 'four-year study.' When describing the duration of a study, the hyphenated form is used to connect the number and the unit of time. 'Four years study' is incorrect because it lacks the hyphen needed to form a compound adjective.

Last updated: March 25, 2024 • 814 views

Correct. This phrase is commonly used in English to describe a study lasting four years.

"four-year study"

Use 'four-year study' when you want to specify that a study lasted for a period of four years. The hyphen between 'four' and 'year' is necessary to form a compound adjective.

Examples:

She conducted a four-year study on the effects of climate change.
The university is offering a new four-year study program in computer science.
The results of the four-year study were published in a scientific journal.
The researchers completed a comprehensive four-year study on biodiversity.
The four-year study revealed significant findings about human behavior.

Show examples from the web [+]

The Dermatology Faculty of Bologna University carried out a four-year study on children aged 6 to 10 who showed signs of baldness.
In a four-year study, 1,000 people were made to exercise four hours a week for 20 weeks.
At the end of the four-year study, 21% of the patients treated with Xenical had lost more than 10% of their body weight, compared with 10% of the patients who received placebo.
The Dermatology Faculty of Bologna University carried out a four-year study on children aged 6 to 10 who showed signs of baldness.
The four-year study found that a 10-decibel increase in average aircraft noise levels at night caused the risk of high blood pressure to increase by 14 %.
A four-year study with 4432 patients who had a low bone mass but had not had any vertebral fracture at the start of the study.
A major four-year British study on GMOs has shown that growing genetically engineered plants unquestionably leads to impoverishment of flora and fauna.
I did not interview men for the first four years of my study.
The directive at present stipulates four years' full-time study.
There is no logical reason why the Commission should wait four years before finalising a study to investigate this area.
In the last three to four years, the studies carried out by David Dollar of the World Bank have been the object of substantial criticism, including methodological and theoretical objections: it is not proven that liberalisation creates greater wealth.
Currently, pharmacy requires four years of university study leading to the award of the title MPharm (Master of Pharmacy).
Article 46 of Directive 2005/36/EC on the recognition of professional qualifications states that 'Training as an architect shall comprise a total of at least four years of full-time study'.
According to the Commission, only a German diploma obtained after four years' studies would satisfy the conditions for admission to the competition, which stipulated that the necessary diplomas must give access to doctoral studies.
which represents education of a total duration of at least 14 years, comprising eight/nine years of basic education, four years of study at secondary pedagogical school or at another secondary school and two years of supplementary part-time pedagogical study.
Training as an architect shall comprise a total of at least four years of full-time study or six years of study, at least three years of which on a full-time basis, at a university or comparable teaching institution.
Training as an architect shall comprise a total of at least four years of full-time study or six years of study, at least three years of which on a full-time basis, at a university or comparable teaching institution.
The studies included very few children aged below four years.
The study was then extended to four years.
The additional studies showed that the presence of antibodies was maintained for at least four years.

Incorrect. This phrase is not used in English. The correct form requires the hyphen to create a compound adjective.

"four years study"

Show examples from the web [+]

In a four-year study, 1,000 people were made to exercise four hours a week for 20 weeks.
The Dermatology Faculty of Bologna University carried out a four-year study on children aged 6 to 10 who showed signs of baldness.
The Dermatology Faculty of Bologna University carried out a four-year study on children aged 6 to 10 who showed signs of baldness.
The four-year study found that a 10-decibel increase in average aircraft noise levels at night caused the risk of high blood pressure to increase by 14 %.
A four-year study with 4432 patients who had a low bone mass but had not had any vertebral fracture at the start of the study.
At the end of the four-year study, 21% of the patients treated with Xenical had lost more than 10% of their body weight, compared with 10% of the patients who received placebo.
A major four-year British study on GMOs has shown that growing genetically engineered plants unquestionably leads to impoverishment of flora and fauna.
I did not interview men for the first four years of my study.
The directive at present stipulates four years' full-time study.
There is no logical reason why the Commission should wait four years before finalising a study to investigate this area.
In the last three to four years, the studies carried out by David Dollar of the World Bank have been the object of substantial criticism, including methodological and theoretical objections: it is not proven that liberalisation creates greater wealth.
Currently, pharmacy requires four years of university study leading to the award of the title MPharm (Master of Pharmacy).
Article 46 of Directive 2005/36/EC on the recognition of professional qualifications states that 'Training as an architect shall comprise a total of at least four years of full-time study'.
According to the Commission, only a German diploma obtained after four years' studies would satisfy the conditions for admission to the competition, which stipulated that the necessary diplomas must give access to doctoral studies.
which represents education of a total duration of at least 14 years, comprising eight/nine years of basic education, four years of study at secondary pedagogical school or at another secondary school and two years of supplementary part-time pedagogical study.
Training as an architect shall comprise a total of at least four years of full-time study or six years of study, at least three years of which on a full-time basis, at a university or comparable teaching institution.
Training as an architect shall comprise a total of at least four years of full-time study or six years of study, at least three years of which on a full-time basis, at a university or comparable teaching institution.
The studies included very few children aged below four years.
The study was then extended to four years.
The additional studies showed that the presence of antibodies was maintained for at least four years.

Alternatives:

five-year study
three-year study
two-year study
long-term study
short-term study

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four-year study vs four years study

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