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Table 1 Teacher and student demographics

From: Mental health first aid training for high school teachers: a cluster randomized trial

Characteristics Intervention group Control group Total
Teachers n 221 106 327
Gender n (%):    
   Male 78 (35.3) 36 (34.0) 114 (34.9)
   Female 143 (64.7) 70 (66.0) 213 (65.1)
Time working in schools n (%):    
   Less than 3 years 24 (10.9) 4 (3.9) 28 (8.6)
   3-5 years 30 (13.6) 13 (12.5) 43 (13.2)
   6-10 years 28 (12.7) 13 (12.5) 41 (12.6)
   11-15 years 22 (10) 7 (6.7) 29 (8.9)
   16-20 years 22 (10) 14 (13.5) 36 (11.1)
   More than 20 years 95 (43) 53 (51) 148 (45.5)
Time working in current school n (%):    
   Less than 1 year 34 (15.4) 15 (14.4) 49 (15.1)
   1-2 years 34 (15.4) 16 (15.4) 50 (15.4)
   3-5 years 54 (24.4) 18 (17.3) 72 (22.2)
   6-10 years 53 (24.0) 26 (25.0) 79 (24.3)
   11-15 years 21 (9.5) 15 (14.4) 36 (11.1)
   16-20 years 10 (4.5) 5 (4.8) 15 (4.6)
   More than 20 years 15 (6.8) 9 (8.7) 24 (7.4)
Main role in school n (%):    
   Leadership 38 (17.4) 28 (27.2) 66 (20.5)
   Classroom teacher 146 (66.7) 58 (56.3) 204 (63.4)
   Student welfare/counsellor 15 (6.9) 6 (5.8) 21 (6.5)
   Support officer (SSO) 14 (6.4) 7 (6.8) 21 (6.5)
   Other 6 (2.7) 4 (3.9) 10 (3.1)
Teaching subjects n (%):    
   Arts 40 (18.1) 16 (15.1) 56 (17.1)
   English 61 (27.6) 29 (27.4) 90 (27.5)
   Technology 30 (13.6) 11 (10.4) 41 (12.5)
   Language other than English 10 (4.5) 7 (6.6) 17 (5.2)
   Studies of Society and Environment 57 (25.8) 32 (30.2) 89 (27.2)
   Science 44 (19.9) 20 (18.9) 64 (19.6)
   Physical Education 30 (13.6) 19 (17.9) 49 (15.0)
   Mathematics 49 (22.2) 24 (22.6) 73 (22.3)
Students n 982 651 1,633
Gender n (%):    
   Male 451 (46.2) 295 (45.6) 746 (46.0)
   Female 525 (53.8) 352 (54.4) 877 (54.0)
Age n (%):    
   12 75 (7.7) 36 (5.6) 111 (6.9)
   13 363 (37.4) 256 (39.9) 619 (38.4)
   14 317 (32.7) 220 (34.3) 537 (33.3)
   15 215 (22.2) 130 (20.3) 345 (21.4)
Grade n (%):    
   7 31 (3.2) 8 (1.2) 39 (2.4)
   8 403 (41.3) 293 (45.2) 696 (42.8)
   9 308 (31.6) 208 (32.1) 516 (31.8)
   10 234 (24.0) 140 (21.6) 374 (23.0)
Language spoken at home n (%):    
   English 901 (92.2) 591 (91.2) 1,492 (91.8)
   Another language 10 (1.0) 12 (1.9) 22 (1.4)
   English and another language 66 (6.8) 45 (6.9) 111 (6.8)