. 1999 Jul 7;107(1):62–67. doi: 10.1016/S0002-9343(99)00167-9

Table 3.

Summary Mean Differences between Antibiotic and Placebo Groups^legend

Outcome Measure (reference)	Summary Mean Difference (95% CI)^∗
Days of purulent sputum (6 trials) 32, 33, 34, 35, 36, 37	0.4 days (−0.1–0.8)
Days of cough (4 trials) 32, 33, 34, 35	0.5 days (−0.1–1.1)^†
Time off work (6 trials) 32, 33, 34, 35, 36, 37	0.3 days (−0.6–1.1)^†

^∗

Summary mean difference is the weighted average of the difference between the antibiotic and placebo groups in the mean outcome measure for each study.

^†

A test of heterogeneity was statistically significant.

^legend

CI = confidence interval.