Suchert 2015.

Study characteristics
Methods	Study design: cluster‐RCT
Participants	School inclusion criteria: schools selected from a complete list of all secondary schools in Schleswig Holstein obtained from the Ministry of Education School exclusion criteria: schools for disabled students Student inclusion criteria: all students in participating classes Student exclusion criteria: — Setting: school Age group: adolescents Gender distribution: females and males Country/Countries where trial was performed: Germany
Interventions	Intervention: the intervention operates at 4 levels: individual, class, school, and parents Student: pedometer use, interactive user account on the "läuft" homepage Class: competitions, educational and practical resources School: informational material, introductory seminar for participating teachers Parent: informational material, parent‐teacher conference Comparator: no further intervention Duration of intervention: 12 weeks Duration of follow‐up: 1 year Number of schools: 29 Theoretical framework: —
Outcomes	Fitness BMI
Study registration	ISRCTN49482118
Publication details	Language of publication: English  Funding: non‐commercial funding (charitable trust) Publication status: peer‐reviewed journal
Stated aim for study	"The aim of the study is to evaluate the implementation and effectiveness of the “läuft” PA program among adolescents in grade 8"
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote from publication: "a stratified randomisation was carried out on the school level (according to type of school and number of participating classes) with the computer program Randomization In Treatment Arms"
Allocation concealment (selection bias)	Low risk	Comment: randomisation conducted using a computer programme
Blinding of participants and personnel (performance bias) All outcomes	High risk	Comment: participants not blinded to intervention
Blinding of outcome assessment (detection bias) All outcomes	High risk	Comment: assessors were not blinded [author communication]
Incomplete outcome data (attrition bias) Anthropometrics, Fitness	Low risk	Quote from publication: "students in the study sample engaged in less out‐of‐school sports activities at baseline than students lost to post‐assessment (P = 0.006). Attrition analyses revealed no further differences. There was no selective attrition between groups"
Selective reporting (reporting bias)	High risk	Comment: reporting of medical testing listed in protocol missing
Cluster RCT ‐ Recruitment bias	High risk	Comment: participants recruited after clusters randomised
Cluster RCT ‐ Baseline imbalance	High risk	Comment: clusters not balanced at baseline
Cluster RCT ‐ Loss of clusters	Low risk	Comment: there was no dropout on school or class level
Cluster RCT ‐ Incorrect analysis	Low risk	Comment: analysis accounted for clustered design