Comparison 3. NSAIDs versus placebo, non‐analgesic effect.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Cough score (random‐effects model)	2	159	Std. Mean Difference (IV, Random, 95% CI)	‐0.05 [‐0.66, 0.56]
2 Sneezing score (fixed‐effect model)	2	159	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.44 [‐0.75, ‐0.12]
3 Total number of sneezes	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.51 [‐0.95, ‐0.06]
4 Rhinorrhoea score (fixed‐effect model)	3	199	Std. Mean Difference (IV, Fixed, 95% CI)	0.03 [‐0.25, 0.30]
5 Nasal obstruction score (fixed‐effect model)	3	199	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.15 [‐0.43, 0.13]
6 Nasal obstruction score > 5	1	27	Risk Ratio (M‐H, Fixed, 95% CI)	5.36 [0.28, 102.12]
7 Total number of nose blows	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	0.17 [‐0.27, 0.61]
8 Total mucus weight	1	40	Std. Mean Difference (IV, Fixed, 95% CI)	0.13 [‐0.49, 0.76]
9 Total tissue number count	1	40	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.20 [‐0.83, 0.42]
10 Score of dryness in the nose	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	0.04 [‐0.40, 0.48]
11 Score of reduced sense of smell	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	0.08 [‐0.36, 0.51]
12 Hoarseness score	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	0.32 [‐0.12, 0.76]
13 Fatigue score	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	0.18 [‐0.26, 0.62]