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Absolute improvements in symptom scores (assessment of heterogeneity: irrigation, q = 194.2, df(Q) = 5, p < 0.001, I2 = 97.4, τ2 ≥ 522.3; spray, q = 59.7, df(Q) = 2, p < 0.001, I2 = 96.7, τ2 = 372.1; overall, q = 385.5, df(Q) = 8, p < 0.001, I2 = 97.9, τ2 = 586.2).
