. 2017 Oct 9;12(10):e0185951. doi: 10.1371/journal.pone.0185951

Table 5. Anteroposterior (AP) changes of OP airway at multiple measurement locations (based on meta-analyses results reported by Mattos et al[18]).

Meta-analyses	Measurement location	Type of surgery	Number of primary studies	Number of patients	Result
Meta-analyses	Measurement location	Type of surgery	Number of primary studies	Number of patients	(AP dimension of OP airway)
1	PNS-pharyngeal wall	Maxillary advancement + mandibular setback	3	62	Significant increase (p<0.00001). MD = 3.81mm [95% CI 2.46, 5.16], I²: 0%,
2	Soft palate-pharyngeal wall	Mandibular setback	5	142	Significant decrease (p<0.00001). MD = -2.57mm [95% CI -3.3, -1.85], I² = 50%
2	Soft palate-pharyngeal wall	Maxillary advancement + mandibular setback	6	159	Significant decrease (p = 0.01). MD = -0.91mm [95%CI -1.62, -0.20], I² = 69%
3	Base of tongue-pharyngeal wall	Mandibular setback	7	190	Significant decrease (p<0.00001). MD = -2.99mm [95% CI -3.67, -2.31], I² = 35%
3	Base of tongue-pharyngeal wall	Maxillary advancement + mandibular setback	2	43	Significant decrease (p<0.00001). MD = -2.83mm [95%CI -3.98, -1.68], I² = 0%
4	Vellacula-pharyngeal wall	Maxillary advancement + mandibular setback	3	63	Significant decrease (p<0.0001). MD = -2.20mm [95% CI -3.23, -1.18], I² = 0%

PNS = posterior nasal spine