Table 1 Descriptive statistics regarding English proficiency, scientific productivity of students and capability of supervisors

Number of articles published as first author

0

2

0.88

0.68

Mean impact factor articles published as first author

0

12.7

1.79

2.44

Self-reported overall level of English

2.13

4.25

2.84

0.57

Self-reported writing level of English

1

4

3.25

0.72

Self-reported reading level of English

2

5

2.09

0.83

English test score at enrollment

50

96

79.12

11.10

H-index of supervisors

3

33

13.09

7.04