Even though neither effect was statistically significantly different from no effect, a test of interaction was marginally statistically significant ( P -value for interaction = 0.023) meaning that there was statistical evidence that these two estimated treatment effects (both statistically non-significant) were statistically significantly different between themselves.
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Hypertonic saline nasal irrigation and gargling for suspected or confirmed COVID-19: Pragmatic randomised controlled trial (ELVIS COVID-19).
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