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Table 1 Statistical power (at the two-sided 5% significance level) of the simplified design forms shown in Fig. 3, under different models for the time effect (polynomials of degree 2, 4, 6 or 8), to detect effect size δ/σ = 0.3, with K = 30, M = 100, ρ = 0.05, τ = 0.2

From: The hunt for efficient, incomplete designs for stepped wedge trials with continuous recruitment and continuous outcome measures

  Polynomial degree
Simplified form 2 4 6 8
2-phase 89% 37% 35% 22%
3-phase 90% 90% 37% 33%
4-phase 89% 89% 89% 43%
Staircase 89% 89% 89% 89%