Table 1 Characteristics of participants in the trial

School characteristics

Schools

N

42

42

Province

 Eastern

N (%)

14 (33.3%)

12 (28.6%)

 Kigali City

N (%)

5 (11.9%)

1 (2.4%)

 Northern

N (%)

9 (21.4%)

10 (23.8%)

 Southern

N (%)

9 (21.4%)

7 (16.7%)

 Western

N (%)

5 (11.9%)

12 (28.6%)

School type

 Boarding

N (%)

15 (35.7%)

14 (33.3%)

 Day schools

N (%)

27 (64.3%)

28 (66.7%)

School ownership

 Government aided

N (%)

19 (45.2%)

26 (61.9%)

 Private

N (%)

8 (19.0%)

5 (11.9%)

 Public

N (%)

15 (35.7%)

11 (26.2%)

School performance

 Low

N (%)

24 (57.1%)

24 (57.1%)

 High

N (%)

18 (42.9%)

18 (42.9%)

Completed tests per class

Median (IQR)

28 (24 to 35)

32 (26 to 38)

Teacher characteristics

Teachers

N

42

42

Completed test

N (%)

35 (83.3%)

35 (83.3%)

Education level^a

 Advanced diploma

N (%)

19 (45.2%)

9 (21.4%)

 Bachelor’s degree

N (%)

15 (35.7%)

26 (61.9%)

 Masters

N (%)

1 (2.4%)

0 (0.0%)

Experience (years)^a

Mean (SD)

9.2 (5.9)

8.5 (5.7)

Students’ characteristics

Recruited in the study

N

1556

1572

Completed test

N

1181

1238

Gender^a

 Female

N (%)

665 (56.3%)

696 (56.2%)

 Male

N (%)

516 (43.7%)

542 (43.8%)

Age^a

Mean (SD)

15.6 (1.3)

15.6 (1.4)