Table 1.

Participating countries by World Bank income class and number of participants completing both tests. The income classes were upper middle (UM), lower middle (LM), and lower (L) resource countries

Country	Income class	Participants (n)
A	UM	6
B	UM	7
C	UM	32
D	UM	56
E	UM	20
F	LM	13
G	LM	42
H	L	41
I	L	7
Total		224