CHIZU — the atlas of coffee research
Coffee research in United States
Two limits come with this count. Only 100,474 of the 190,643 searchable papers (52.7%) carry an author affiliation country. The other 90,169 (47.3%) carry none. So these 17,988 papers are 17,988 out of the 100,474 whose affiliation is known. And a co-authored paper is counted once for every country its authors sit in. Per-country counts therefore do not add up to the whole.
United States does not grow coffee, but coffee is researched there.
Check it yourself
This is not our word for it. You can run the same query against the same index.
When they were written
1694–2026
17,984 of the 17,988 papers carry a year. The rest have none.
Years before 1600 are treated as unknown. The upstream data (OpenAlex) sometimes writes 1400 when the year is missing, and that is a placeholder, not a measurement.
Where they appeared
Top 8 sources (journals and repositories)
Most cited
10 papers, most cited first
- Reach and grasp by people with tetraplegia using a neurally controlled robotic arm2012cited 2,750open access
- Dietary and Policy Priorities for Cardiovascular Disease, Diabetes, and Obesity2016cited 2,212open access
- A Logit Model of Brand Choice Calibrated on Scanner Data1983cited 1,860open access
- Legumes: Importance and Constraints to Greater Use2003cited 1,783open access
- Guidelines for the Diagnosis and Management of Gastroesophageal Reflux Disease2013cited 1,769
- Platelet-Rich Plasma (PRP): What Is PRP and What Is Not PRP?2001cited 1,682
- Experiencing Physical Warmth Promotes Interpersonal Warmth2008cited 1,426open access
- The greener synthesis of nanoparticles2013cited 1,351
- Do Consumers Care about Ethics? Willingness to Pay for Fair‐Trade Coffee2005cited 1,335
- Genome sequence of the metazoan plant-parasitic nematode Meloidogyne incognita2008cited 1,302open access
Which stage of coffee
Only 30.2% of the whole index carries a stage label. Of this country's 17,988 papers, 6,091 carry one. The breakdown below is about those 6,091 papers only — the rest were never candidates for it.
One paper can carry several labels, so the breakdown adds up to more than that number.
Which field
Only 75.9% of the whole index carries a field label. Of this country's 17,988 papers, 13,723 carry one. The breakdown below is about those 13,723 papers only — the rest were never candidates for it.
One paper can carry several labels, so the breakdown adds up to more than that number.
What language
"undetermined" means the upstream record carried no language. We did not guess one.
Knowledge is not evenly spread
Counting only papers whose author affiliation is known, the largest is Indonesia with 22,248. United States has 17,988 — a factor of 1.
That gap does not follow where coffee is grown. Research gathers where the means to do research are, not where the coffee is. Making that visible is why CHIZU exists.
Other countries
Indonesia 22,248Brazil 10,857United Kingdom 5,569China 4,887India 3,542Germany 3,185Italy 3,111France 3,072Japan 2,822Colombia 2,489Spain 2,363Canada 2,352