Table 58. Statistical profile of doctorate recipients in physical sciences and earth sciences fields, by sex and field of study: 2015
Characteristic |
All physical sciences and earth sciences fields |
Chemistry |
Geosciences, atmospheric, and ocean sciences |
Physics and astronomy |
All doctorate recipients (number)a |
5,924 |
2,675 |
1,057 |
2,192 |
Sex (%) |
|
|
|
|
Male |
66.4 |
59.7 |
56.8 |
79.2 |
Female |
33.6 |
40.3 |
43.2 |
20.7 |
Unknown |
* |
0.0 |
0.0 |
* |
Citizenship (%) |
|
|
|
|
U.S. citizen or permanent resident |
58.8 |
58.8 |
66.6 |
54.9 |
Temporary visa holder |
35.5 |
34.9 |
29.0 |
39.4 |
Unknown |
5.7 |
6.3 |
4.4 |
5.7 |
Marital status (%) |
|
|
|
|
Never married |
38.6 |
39.9 |
32.8 |
39.8 |
Married |
38.3 |
36.9 |
43.5 |
37.5 |
Marriage-like relationship |
9.9 |
9.7 |
11.4 |
9.4 |
Separated, divorced, widowed |
1.9 |
1.9 |
2.3 |
1.7 |
Unknown |
11.3 |
11.5 |
10.0 |
11.5 |
Bachelor's in same field as doctorate (%)b |
68.3 |
72.4 |
47.3 |
73.3 |
Master's earned (%) |
50.6 |
35.1 |
67.5 |
61.2 |
Age at doctorate (median years) |
29.6 |
29.1 |
30.7 |
29.8 |
Time to doctorate (median years) |
|
|
|
|
From bachelor's |
7.0 |
6.3 |
8.0 |
7.1 |
From graduate school start |
6.2 |
5.7 |
7.0 |
6.3 |
From doctoral program startc |
5.7 |
5.3 |
5.6 |
5.9 |
Male doctorate recipients (number) |
3,935 |
1,598 |
600 |
1,737 |
Citizenship (%) |
|
|
|
|
U.S. citizen or permanent resident |
58.2 |
58.9 |
64.7 |
55.3 |
Temporary visa holder |
35.8 |
34.2 |
31.0 |
38.9 |
Unknown |
6.0 |
6.8 |
4.3 |
5.8 |
Marital status (%) |
|
|
|
|
Never married |
38.9 |
39.2 |
33.5 |
40.5 |
Married |
38.9 |
37.7 |
44.3 |
38.0 |
Marriage-like relationship |
9.3 |
9.4 |
10.7 |
8.6 |
Separated, divorced, widowed |
1.6 |
1.5 |
2.5 |
1.4 |
Unknown |
11.3 |
12.1 |
9.0 |
11.4 |
Bachelor's in same field as doctorate (%)b |
69.2 |
72.2 |
48.5 |
73.7 |
Master's earned (%) |
51.5 |
35.4 |
69.8 |
59.9 |
Age at doctorate (median years) |
29.7 |
29.3 |
31.2 |
29.8 |
Time to doctorate (median years) |
|
|
|
|
From bachelor's |
7.0 |
6.4 |
8.0 |
7.1 |
From graduate school start |
6.2 |
5.7 |
7.0 |
6.3 |
From doctoral program startc |
5.7 |
5.3 |
5.7 |
5.9 |
Female doctorate recipients (number) |
1,988 |
1,077 |
457 |
454 |
Citizenship (%) |
|
|
|
|
U.S. citizen or permanent resident |
59.9 |
58.7 |
69.1 |
53.3 |
Temporary visa holder |
35.0 |
35.8 |
26.5 |
41.4 |
Unknown |
5.2 |
5.5 |
4.4 |
5.3 |
Marital status (%) |
|
|
|
|
Never married |
38.1 |
41.0 |
31.9 |
37.2 |
Married |
37.2 |
35.7 |
42.5 |
35.7 |
Marriage-like relationship |
11.2 |
10.1 |
12.3 |
12.6 |
Separated, divorced, widowed |
2.5 |
2.6 |
2.0 |
2.6 |
Unknown |
11.1 |
10.6 |
11.4 |
11.9 |
Bachelor's in same field as doctorate (%)b |
66.4 |
72.8 |
45.7 |
72.0 |
Master's earned (%) |
48.8 |
34.8 |
64.3 |
66.3 |
Age at doctorate (median years) |
29.3 |
28.8 |
30.3 |
29.5 |
Time to doctorate (median years) |
|
|
|
|
From bachelor's |
6.8 |
6.3 |
8.0 |
7.1 |
From graduate school start |
6.0 |
5.7 |
6.9 |
6.4 |
From doctoral program startc |
5.5 |
5.3 |
5.4 |
6.0 |