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Table 1 Outline of the cluster design and sample size for the SR cRCT in Busia County, Kenya

From: Evaluation of the protective efficacy of a spatial repellent to reduce malaria incidence in children in western Kenya compared to placebo: study protocol for a cluster-randomized double-blinded control trial (the AEGIS program)

Cluster design Baseline cohort Intervention cohorts
4-month follow-up (n = 2040) Time of intervention deployment 12-month follow-up (cohort 1) (n = 2040) 12-month follow-up (cohort 2) (n = 2040)
Core area
60 clusters total
20 subjects per cluster
1200 subjects total
Year 1 SR (30 clusters), Placebo (30 clusters)
14 subjects per cluster
840 subjects total
n/a
Year 2 n/a SR (30 clusters), Placebo (30 clusters)
14 subjects per cluster
840 subjects total
Buffer zone
60 clusters total
14 subjects per cluster
840
subjects total
Year 1 SR (30 clusters), Placebo (30 clusters)
20 subjects per cluster
1200 subjects total
n/a
Year 2 n/a SR (30 clusters), Placebo (30 clusters)
20 subjects per cluster
1200 subjects total