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Stepped-wedge cluster randomized trials, which randomize clusters of subjects to treatment sequences in which clusters switch from control to intervention conditions, are being conducted with increasing frequency. Due to the real-world nature of this design, methodological and implementation challenges are ubiquitous. To account for such challenges, more complex statistical models to plan studies and analyze data are required. In this paper, we consider stepped-wedge trials that accommodate treatment effect heterogeneity across clusters, implementation periods during which no data are collected, or both treatment effect heterogeneity and implementation periods. Previous work has shown that the sequence-period cells of a stepped-wedge design contribute unequal amounts of information to the estimation of the treatment effect. In this paper, we extend that work by considering the amount of information available for the estimation of the treatment effect in each sequence-period cell, sequence, and period of stepped-wedge trials with more complex designs and outcome models. When either treatment effect heterogeneity and/or implementation periods are present, the pattern of information content of sequence-period cells tends to be clustered around the times of the switch from control to intervention condition, similarly to when these complexities are absent. However, the presence and degree of treatment effect heterogeneity and the number of implementation periods can influence the information content of periods and sequences markedly. [ABSTRACT FROM AUTHOR]

Aim: To establish international expert recommendations on clinical features to prompt referral for diagnostic assessment of cerebral palsy (CP).Method: An online Delphi survey was conducted with international experts in early identification and intervention for children with CP, to validate the results obtained in two previous consensus groups with Canadian content experts and knowledge users. We sent two rounds of questionnaires by e-mail. Participants rated their agreement using a 4-point Likert scale, along with optional open-ended questions for additional feedback. Additionally, a panel of experts and knowledge-users reviewed the results of each round and determined the content of subsequent surveys.Results: Overall, there was high-level of agreement on: (1) six clinical features that should prompt referral for diagnosis; (2) two 'warning sign' features that warrant monitoring rather than immediate referral for diagnosis; and (3) five referral recommendations to other healthcare professionals to occur simultaneously with referral for diagnosis.Interpretation: There was high agreement among international experts, suggesting that the features and referral recommendations proposed for primary care physicians for early detection of CP were broadly generalizable. These results will inform the content of educational tools to improve the early detection of CP in the primary care context.What This Paper Adds: International experts provide strong agreement on clinical features to detect cerebral palsy. Consensus on clinical 'warning signs' to monitor over time. Referral recommendations from primary care to specialized health services are identified. [ABSTRACT FROM AUTHOR]