Table 2

Mean Days of Any Cough, Daytime Cough, Nighttime Cough, and Productive Cough

Outcome First Author, Year	Patients Studied	Days of Cough Mean (SD)
Any cough		17.8^a
Williamson, 1984	32	28.6
Nduba, 2008	275	15.3 (4.3)
Scherl, 1987	15	17.8
Little, 2005	269	21.3 (5.8)
Butler, 2010	1,230	17.3 (6.6)
Daytime cough		12.7^a
Stott, 1976	103	10.3 (3)
Verheij, 1994	69	16.2 (3.2)
Nighttime cough		10.4^a
Stott, 1976	84	8.9 (3.1)
Verheij, 1994	69	12.2 (2.7)
Productive cough		13.9^a
Williamson, 1984	32	13.7
Scherl, 1987	15	17.4
Verheij, 1994	69	13.3 (3)

Note: standard deviation shown only if reported by the original study.

↵a Weighted mean.