Table 2.

Behavioral proficiency scores

Subject	Native Language (L1)	Age at Time of Scanning, yr (mo)	Age Started English, yr	English Experience, yr	Use of English* (maximum score, 21)	CPE Speaking Grade†
1	Greek	24 (10)	12	12	18	C1+
2	Italian	25 (2)	7	18	14	C2
3	German	25 (5)	11	14	18	nd
4	Dutch	32 (7)	11	21	12	C2
5	French	24 (2)	14	10	21	nd
6	French	26 (7)	12	14	14	nd
7	Spanish	27 (7)	20	7	11	C1
8	Chinese	26 (10)	11	15	13	nd
9	Chinese	26 (4)	12	14	13	C1+
10	Spanish	26 (5)	8	18	17	B2+
11	Indonesian	23 (6)	17	6	21	B2+
12	Polish	31 (6)	13	18	13	C1
13	Russian	26 (8)	11	15	17	B2+
14	Polish	25 (11)	12	13	18	C1+
15	Spanish	32 (11)	5	27	15	C1
16	Italian	28 (5)	13	15	19	B2+
17	Greek	20 (11)	9	11	9	C1
18	French	35 (10)	21	14	12	nd

^*Subjects were asked to describe their current use of English on a sliding scale from 1 to 7, with native language only as 1 and English only as 7, for 3 categories: at work, at home, and other places. A score of 21 would show that the subject only uses English, and a score of 3 would means that they only use their native language.

^†There are 11 grades in the Cambridge ESOL Examinations Assessments scales for the Certificate of Proficiency in English (CPE) (from low to high: A1, A1+, A2, A²⁺, B1, B1+, B2, B²⁺, C1, C1+, C2). nd, data are not available for these subjects.