Data
U. Iowa
| Fields | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 |
|---|---|---|---|---|---|---|---|---|---|---|
| All fields | 308 | 319 | 286 | 302 | 311 | 322 | 347 | 368 | 344 | 361 |
| Science and engineering | 233 | 239 | 216 | 206 | 224 | 237 | 247 | 244 | 234 | 258 |
| Agricultural sciences and natural resources | . | . | 1 | . | . | . | . | . | . | 2 |
| Agricultural sciences | . | . | 1 | . | . | . | . | . | . | 1 |
| Natural resources and conservation | . | . | . | . | . | . | . | . | . | 1 |
| Biological and biomedical sciences | 71 | 72 | 60 | 49 | 57 | 81 | 50 | 75 | 80 | 79 |
| Biochemistry and biophysics | 3 | 7 | 5 | 6 | 11 | 6 | 3 | 4 | 3 | 2 |
| Biology and biomedical sciences, general | 9 | 9 | 9 | 3 | 1 | 4 | 1 | 4 | 3 | 2 |
| Bioinformatics, biostatistics, and computational biology | 7 | 5 | 4 | 2 | 5 | 11 | 6 | 9 | 4 | 1 |
| Cellular and developmental biology, and anatomy | 3 | . | 1 | 1 | 2 | 4 | 3 | 4 | 5 | 3 |
| Ecology, evolutionary biology, and epidemiology | 7 | 6 | 3 | 5 | 6 | 8 | 2 | 10 | 6 | 4 |
| Genetics and genomics | 4 | 4 | 6 | 7 | 4 | 9 | 3 | 6 | 8 | 11 |
| Microbiology and immunology | 11 | 10 | 5 | 7 | 5 | 12 | 9 | 13 | 16 | 19 |
| Molecular biology | 4 | 5 | 6 | 5 | 5 | 4 | 6 | 2 | 7 | 10 |
| Neurobiology and neurosciences | 8 | 9 | 7 | 7 | 10 | 9 | 7 | 9 | 10 | 9 |
| Pharmacology and toxicology | 3 | 7 | 7 | 2 | 6 | 4 | 5 | 7 | 7 | 12 |
| Physiology, pathology, and cancer biology | 11 | 9 | 7 | 4 | 2 | 10 | 3 | 4 | 10 | 5 |
| Biology and biomedical sciences, other | 1 | 1 | . | . | . | . | 2 | 3 | 1 | 1 |
| Computer and information sciences | 9 | 4 | 7 | 9 | 10 | 1 | 6 | 4 | 10 | 3 |
| Computer science | 6 | 3 | 4 | 7 | 8 | 1 | 4 | 4 | 7 | 2 |
| Computer and information sciences, other | 3 | 1 | 3 | 2 | 2 | . | 2 | . | 3 | 1 |
| Engineering | 43 | 30 | 35 | 30 | 35 | 29 | 52 | 31 | 32 | 37 |
| Bioengineering and biomedical engineering | 8 | 4 | 5 | 5 | 9 | 3 | 13 | 8 | 7 | 9 |
| Chemical and petroleum engineering | 7 | 3 | 1 | 4 | 5 | 5 | 2 | 2 | 6 | 2 |
| Civil, environmental, and transportation engineering | 11 | 9 | 8 | 3 | 6 | 4 | 7 | 6 | 6 | 9 |
| Electrical and computer engineering | 6 | 5 | 8 | 3 | 8 | 7 | 14 | 7 | 6 | 6 |
| Industrial engineering and operations research | 3 | 3 | 4 | 6 | . | 2 | 2 | 2 | 2 | 4 |
| Materials and mining engineering | 1 | . | . | . | . | . | 1 | 1 | . | . |
| Mechanical engineering | 3 | 4 | 8 | 9 | 6 | 8 | 12 | 4 | 4 | 7 |
| Engineering, other | 4 | 2 | 1 | . | 1 | . | 1 | 1 | 1 | . |
| Geosciences, atmospheric, and ocean sciences | 3 | 3 | 4 | 5 | 5 | 5 | 6 | 6 | 1 | 4 |
| Geological sciences | 2 | 2 | 3 | 4 | 2 | 1 | 5 | 4 | 1 | 3 |
| Ocean, marine, and atmospheric sciences | 1 | 1 | 1 | 1 | 3 | 4 | 1 | 2 | . | 1 |
| Health sciences | 24 | 40 | 21 | 30 | 24 | 27 | 23 | 34 | 25 | 37 |
| Nursing science | 1 | 5 | 3 | 3 | 2 | 4 | 4 | 4 | 3 | 8 |
| Pharmaceutical sciences | 7 | 12 | 5 | 6 | 9 | 8 | 4 | 11 | 9 | 11 |
| Public health | 8 | 16 | 3 | 8 | 5 | 7 | 10 | 8 | 2 | 5 |
| Health sciences, other | 8 | 7 | 10 | 13 | 8 | 8 | 5 | 11 | 11 | 13 |
| Mathematics and statistics | 14 | 20 | 20 | 17 | 20 | 13 | 28 | 20 | 10 | 17 |
| Applied mathematics | 6 | 4 | 3 | 3 | 4 | 8 | 10 | 5 | 2 | 5 |
| Mathematics | 1 | 2 | 3 | 2 | 5 | 1 | 7 | 6 | 4 | 6 |
| Statistics | 2 | 7 | 4 | 6 | 4 | 1 | 3 | . | 2 | 2 |
| Mathematics and statistics, other | 5 | 7 | 10 | 6 | 7 | 3 | 8 | 9 | 2 | 4 |
| Physical sciences | 32 | 35 | 32 | 27 | 32 | 36 | 33 | 28 | 23 | 30 |
| Astronomy and astrophysics | 2 | 5 | 5 | 1 | . | 1 | 2 | 2 | 1 | 1 |
| Chemistry | 24 | 22 | 20 | 21 | 23 | 23 | 23 | 18 | 12 | 22 |
| Physics | 6 | 8 | 7 | 5 | 9 | 12 | 8 | 8 | 10 | 7 |
| Psychology | 16 | 13 | 20 | 22 | 23 | 19 | 27 | 25 | 25 | 14 |
| Clinical psychology | 3 | 3 | 5 | 2 | 8 | 3 | 9 | 2 | 3 | . |
| Counseling and applied psychology | 7 | 6 | 12 | 8 | 9 | 10 | 6 | 8 | 7 | 7 |
| Research and experimental psychology | 3 | 1 | 3 | 9 | 3 | 4 | 4 | 11 | 10 | 5 |
| Psychology, other | 3 | 3 | . | 3 | 3 | 2 | 8 | 4 | 5 | 2 |
| Social sciences | 21 | 22 | 16 | 17 | 18 | 26 | 22 | 21 | 28 | 35 |
| Anthropology | . | 4 | 1 | 2 | 2 | . | 2 | 3 | 4 | 3 |
| Economics | 5 | 1 | 2 | 6 | 2 | 6 | 5 | 3 | 4 | 5 |
| Political science and government | 4 | 5 | 6 | 2 | 2 | 7 | 4 | 5 | 1 | 5 |
| Public policy analysis | . | 1 | . | . | . | . | 1 | . | 1 | 1 |
| Sociology, demography, and population studies | 4 | 5 | 1 | 2 | 2 | 3 | 1 | 2 | 6 | 6 |
| Social sciences, other | 8 | 6 | 6 | 5 | 10 | 10 | 9 | 8 | 12 | 15 |
| Non-science and engineering | 75 | 80 | 70 | 96 | 87 | 85 | 100 | 124 | 110 | 103 |
| Business | 11 | 11 | 9 | 8 | 12 | 5 | 14 | 12 | 12 | 7 |
| Business | 11 | 11 | 9 | 8 | 12 | 5 | 14 | 12 | 12 | 7 |
| Education | 40 | 38 | 35 | 40 | 35 | 33 | 34 | 43 | 41 | 39 |
| Education leadership and administration | 6 | 1 | 2 | 3 | 1 | 2 | 4 | 2 | . | 3 |
| Education research | 28 | 24 | 22 | 24 | 26 | 20 | 19 | 26 | 28 | 22 |
| Teacher education and teaching fields | 6 | 10 | 11 | 13 | 8 | 11 | 11 | 14 | 13 | 14 |
| Education, other | . | 3 | . | . | . | . | . | 1 | . | . |
| Humanities and arts | 15 | 26 | 19 | 38 | 32 | 35 | 42 | 53 | 44 | 43 |
| Letters | 4 | 12 | 11 | 10 | 11 | 15 | 11 | 18 | 18 | 12 |
| Foreign languages and literature | 2 | 1 | 1 | 5 | 3 | 3 | 5 | 7 | 4 | 4 |
| History | 2 | 4 | 1 | 6 | 4 | 5 | 8 | 12 | 7 | 11 |
| Philosophy and religious studies | 1 | 4 | 2 | 6 | 3 | 2 | 7 | 3 | 5 | 3 |
| Music and performing arts | 3 | 2 | . | 4 | 8 | 4 | 4 | 5 | 3 | 6 |
| Humanities and arts, other | 3 | 3 | 4 | 7 | 3 | 6 | 7 | 8 | 7 | 7 |
| Other non-science and engineering | 9 | 5 | 7 | 10 | 8 | 12 | 10 | 16 | 13 | 14 |
| Communication | 5 | 4 | 5 | 8 | 6 | 11 | 8 | 14 | 10 | 12 |
| Public administration and social services | 3 | . | . | 2 | 1 | 1 | 2 | . | 2 | 2 |
| Non-science and engineering, other | 1 | 1 | 2 | . | 1 | . | . | 2 | 1 | . |
NOTES:
- . = data were not collected at this level or institution was not eligible to participate for this survey year.
SOURCE: National Center for Science and Engineering Statistics, Survey of Earned Doctorates
