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Field
Trial Status
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Before
in_development
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After
on_going
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Field
Last Published
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Before
October 02, 2016 04:11 PM
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After
November 09, 2016 05:39 AM
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Field
Intervention Start Date
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Before
October 24, 2016
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After
November 10, 2016
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Field
Primary Outcomes (End Points)
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Before
The two primary outcome measures, will be attendance rate in their maths and/or English GCSE classes, and the final grade achieved for the subject. This data is collected using the college administrative datasets.
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After
The two primary outcome measures, will be attendance rate in their maths and/or English GCSE classes, and the final grade achieved for the subject (GCSE: A*-C is pass, below C is fail). This data is collected using the college administrative datasets.
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Field
Randomization Method
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Before
Randomisation performed using STATA.
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After
Randomisation performed using Stata.
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Field
Planned Number of Observations
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Before
1250 (after opt-in)
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After
1000 (after opt-in)
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Field
Sample size (or number of clusters) by treatment arms
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Before
315 students per treatment arm, evenly distributed across 4 arms (including control).
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After
250 students per treatment arm, evenly distributed across 4 arms (including control).
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
Power calculations, adjusted for pre-treatment covariates and baseline outcome measures. We assume an opt-in rate of 50%. Primary outcome variable: continuous, centred on 3, SD of 1.2.
N = 313 per arm, MDES = .151
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After
Power calculations, adjusted for pre-treatment covariates and baseline outcome measures. We will be collecting learners’ opt-in responses before randomisation. Binary outcome measure (pass/fail). With power set to 0.80 and alpha set to 0.05, and N = 250 per arm, observable treatment effect = 5.9%, MDES = .141.
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