Relationship between Smoking and Acute Mountain Sickness: A Meta-Analysis of Observational Studies

Table 1

Characteristics of included studies according to Newcastle-Ottawa Quality Assessment Scale.

Study	Selection	Comparability	Exposure/; outcome	NOS scale
Wu et al., 2012				6
Li et al., 2011				7
Wagner et al., 2008				5
You et al., 2012				7
Vinnikov et al., 2014				6
McDevitt et al., 2014				5
Mairer et al., 2009				5
Mairer et al., 2010				5
Mairer et al., 2010				5
Schneider et al., 2001				5
Schneider et al., 2001				5

Note. Each star represents a high-quality criterion accomplished by the study.