Comparison 2. NSAIDs versus placebo, analgesic effect.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Throat irritation score (fixed‐effect model)	2	159	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.01 [‐0.33, 0.30]
2 Headache score (random‐effects model)	2	159	Std. Mean Difference (IV, Random, 95% CI)	‐0.65 [‐1.11, ‐0.19]
3 Score of pain in muscles/joints score (fixed‐effect model)	2	114	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.40 [‐0.77, ‐0.03]
4 Malaise score (fixed‐effect model)	2	159	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.29 [‐0.60, 0.03]
5 Chilliness score (random‐effects model)	2	159	Std. Mean Difference (IV, Random, 95% CI)	‐0.03 [‐1.12, 1.06]
6 Nose irritation score	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.04 [‐0.48, 0.40]
7 Score of pain on swallowing	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.07 [‐0.51, 0.37]
8 Eye itching score	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.14 [‐0.58, 0.30]
9 Earache score	1	80	Std. Mean Difference (IV, Fixed, 95% CI)	‐0.59 [‐1.04, ‐0.14]