Table 3.

Summary of reviewed exhaled nitric oxide values (ppb) for the normal healthy population: adults (A), children (B).

First author		n	Mean	Standard deviation	Standard error	Median	Interquartile range
(A)
Kharitonov [51]	2003	59	16.3		8.4
Olin [61]	2004	228				15.7
Smith [62]	2004	47	15.7	12.9
Nguyen [63]	2005	44				13.3	8.8–19.2
Olin [74]	2006	2200				17	12.7–23.5
Olivieri [75]	2006	204	10.8	4.7
Olin [40]	2007	3376	17.9	5.47
Stark [76]	2007	21	14.8	5.8
Travers [46]	2007	528	14.1
Sundy [77]	2007	994	20.5	21.3
Zietkowski [78]	2007	26	18	5.59
Bohadana [42]	2008	39	16.2–33.1	1.5–2.4
Levesque [44]	2008	895	19.7
(B)
Warke [59]	2002	71				9.5	4.9–13.6
Malmberg [60]	2003	96	5.3
Buchvald [53]	2005	405	9.7	7.75
Robroeks [70]	2007	114	14.1				8.2–27.3
Kovesi [45]	2008	657	14.1