Table 2.

Quality assessment.

PAPER	Christie et al., 2010	Zeng and Gao 2013	El and Palomo, 2014	Zhao et al., 2010	Iwasaki et al., 2013	Chang et al., 2013	Ribeiro et al., 2012	Pangrazio-Kulbersh et al., 2012	da Baratieri et al., 2014
Study design
Time	2	2	1	1	1	1	2	2	2
Randomized sample	0	0	0	0	0	0	0	0	0
Control group	0	0	1	1	0	0	0	1	1
Sample size	0	0	1	0	0	0	0	0	0
Sample gender	0	1	1	0	0	0	0	0	2
Objective	1	1	1	1	1	1	0	1	1
Selection criteria	1	1	1	1	1	1	0	1	1
Baseline characteristics	0	0	0	1	0	1	0	0	1
Study measurements
Segmentation method	0	0	1	1	1	1	0	0	0
Type of airway measurements	1	2	3	4	2	3	3	1	2
Blinding measurements method	0	0	0	1	0	0	0	0	1
Data analysis
Statistical analysis	0	1	1	1	1	1	1	0	1
Validation of measurements (error of the method)	1	1	1	1	1	1	0	1	1
Data presentation	2	1	2	2	2	2	2	2	2
Total points	8	10	14	15	10	12	8	9	15
% score	36	45	63	68	45	54	36	40	68