Table 4—

Airway calibre measures for pregnant and post-partum females

	Post-partum^#	Pregnant^#	Differences		p-value
	Post-partum^#	Pregnant^#	Mean	95% CI	p-value
Upper airway seated
OPJ cm²	1.32±0.07	1.30±0.05	0.02	−0.14–0.17	0.85
A_p,mean cm²	1.80±0.06	1.62±0.05	0.18	0.02–0.32	<0.03
V_p cm³	20±0.99	19±0.76	1	−1.50–3.36	0.44
Upper airway supine
OPJ cm²	1.12±0.04	1.06±0.04	0.06	−0.07–0.19	0.36
A_p,mean cm²	1.67±0.05	1.47±0.05	0.20	0.06–0.35	0.007
V_p cm³	17.09±0.79	16.84±0.71	0.25	−1.97–2.48	0.82
Upper airway lateral
OPJ cm²	1.22±0.05	1.18±0.04	0.057	−0.47–0.16	0.28
A_p,mean cm²	1.75±0.05	1.49±0.04	0.26	0.12–0.39	0.001
V_p cm³	18.09±0.81	16.83±0.56	1.26	−0.63–3.16	0.19
Change from the seated to supine posture
OPJ %	10±4	23±4	−13	−24– −1	<0.04
A_p,mean %	9±3	5±6	4	−11–19	0.61
V_p %	9±5	2±8	6	−15–27	0.55

Data are presented as mean±sem, unless otherwise stated. CI: confidence interval; OPJ: oropharyngeal junction; A_p,mean: mean pharyngeal cross-sectional area; V_p: pharyngeal volume. ^#: n = 50.