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Table 2 Key characteristics of studies included in the review

From: A systematic review and meta-analysis of school-based interventions with health education to reduce body mass index in adolescents aged 10 to 19 years

Characteristic Citations Proportion of Studies N (% of 33) N and % with Significant BMI Outcomes
Intervention delivery
 Teachers [34,35,36,37,38,39, 45, 46, 48,49,50, 52,53,54, 57, 59, 61, 62] 22 (67%) 12 (54%)
 Researchers [55, 56, 58, 63,64,65] 6 (18%) 2 (33%)
 School Nurse [44] 1 (3%) 0
 School Project Officer [43] 1 (3%) 1 (100%)
 Community based instructor [47, 66] 2 (6%) 0
 Not Stated [51] 1 (3%) 0
CPD for teachers Provided [34, 36,37,38,39,40,41,42,43, 45, 48,49,50, 52,53,54, 57, 59, 61] 19 (58%) 12 (63%)
Mode of CPDa
 Textbook/Manual [37, 39, 50, 52, 54, 57, 59] 7 (21%) 3 (43%)
 Seminars/Workshop [36, 38, 40,41,42,43, 53, 54, 61] 9 (27%) 6 (67%)
 Training on Intervention Delivery only [34, 38, 39, 45, 52] 5 (15%) 3 (60%)
 Not stated [48, 49] 2 (6%) 1 (50%)
Included Parental Involvement [36, 37, 39, 40, 42, 43, 46, 48, 49, 52,53,54,55,56, 63, 66] 16 (48%) 9 (56%)
Mode of Parental Involvement
 Text messages/ Emails [37, 46] 2 (6%) 1 (50%)
 Newsletters/Information leaflets [36, 40, 42, 43, 49, 52, 53, 56] 8 (24%) 5 (63%)
 Family workshops/ Parent Engagement [39, 48, 54, 55, 63, 66] 6 (18%) 2 (33%)
Engagement componentsb
 App/Website/CD-ROM/ text messages/ social media [35, 36, 40, 42, 43, 46, 50, 55, 59, 63,64,65,66] 15 (45%) 5 (83%)
 Computer-Tailored Advice [40, 47, 50, 57, 59] 5 (15%) 1 (20%)
 After-school/out of class [35, 36, 38, 40,41,42,43,44, 46, 48, 55, 59, 63] 13 (39%) 5 (38%)
 Games [34, 45] 2 (6%) 1 (50%)
Other Intervention Features
 Environmental modification/ School Policy Change [37, 39, 40, 42, 46, 48, 49, 52, 59, 61] 10 (30%) 6 (60%)
 Community Programme [43, 55] 2 (6%) 1 (50%)
 Exercise/ PA classes [36, 42,43,44, 47, 51,52,53, 56, 58, 63, 66] 12 (36%) 4 (33%)
Study Design
 RCT [3436, 38,39,40,41,42, 45,46,47,48, 50, 52,53,54,55,56,57,58,59, 62, 63] 23 (70%) 9 (39%)
 Non-RCT [37, 41, 43, 49, 51, 60, 61, 64,65,66] 10 (30%) 5 (50%)
Intervention Duration
  < 6 months [34, 38, 41, 42, 45, 47, 48, 50, 53,54,55,56, 58, 60, 62, 65, 66] 17 (52%) 8 (47%)
 6 months- 1 year [36, 44, 51, 59, 63] 5 (15%) 0
 1–2 years [35, 37, 39, 40, 49, 57, 61, 64] 8 (24%) 4 (50%)
  > 2 years [43, 46, 52] 3 (9%) 2 (67%)
Intervention type
 Health education only [34, 45, 50, 60, 62, 64, 65] 7 (21%) 2 (29%)
 Multi-component [35,36,37,38,39,40,41,42,43,44,45, 46,47,48,49, 51,52,53,54,55,56,57,58,59, 61, 63, 66] 26 (79%) [67] 12 (48%)
  1. aTraining on intervention delivery was provided for all interventions. Additional training was also provided for some studies, indicated in the table
  2. bSome studies may include more than one facilitator, delivery mode or intervention strategy
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