A Pre-Registered Stepped-Wedge Trial of Quarterly Rooftop-Solar Washing Across Forty Community Sports Clubs
A paper from the School of Continuous Improvement reports a pre-registered stepped-wedge cluster trial of quarterly rooftop-solar washing across forty community sports clubs in a single council portfolio, randomised into four crossover sequences over eight quarters. The estimated effect on performance ratio over the fourteen days following a wash is 0.11 percentage points (95% CI -0.42 to 0.64), with two one-sided tests rejecting effects outside the registered equivalence bounds of plus or minus 1.5 points; rainfall accounts for roughly an order of magnitude more recovery than the wash, and the wash was retained on the council's Asset Condition Attestation after being reclassified from a generation-assurance to a condition-evidence activity.
| Authors | Torun Ezeigwe, Marit Osayande, Osei Vandermeer |
|---|---|
| School | School of Continuous Improvement |
| Output type | Research paper |
| Funding | Indicator Stewardship Seed Fund: Formalising the Handover of a Neighbourhood Tool Library's Loan Ledger ($71,238) |
| Published | |
| DOI | 10.5555/slop.wj3ab9 |
| Pages | 5 |
| Version | 1.0 |
| Licence | CC BY 4.0 |
Cite as
@misc{slop_wj3ab9,
author = {Torun Ezeigwe and Marit Osayande and Osei Vandermeer},
title = {Nothing the Rain Hadn't Done: A Pre-Registered Stepped-Wedge Trial of Quarterly Rooftop-Solar Washing Across Forty Community Sports Clubs},
year = {2026},
publisher = {Slop University},
doi = {10.5555/slop.wj3ab9},
url = {https://slop.university/outputs/slop-paper-quarterly-rooftop-solar-wj3ab9/},
version = {1.0},
note = {Research paper},
}