Table 4.

Peak cough flow and spirometry in the reclined position

		Patients	Controls	Difference (95% CI)	p Value
	N	27	30
Peak cough flow (L/min)	Mean (SD)	297 (133)	380 (121)	−83 (−153 to −14)	0.019
Peak cough flow (% pred PEF)		61.2 (32.6)	86.3 (17.3)	−25.1 (−38.8 to −11.4)	<0.001
Volume inspired before cough (L)		2.22 (0.83)	3.41 (0.72)	−1.19 (−1.72 to 0.67)	<0.001
Volume inspired before cough (% pred VC)		64.3 (19.5)	94.6 (15.6)	−30.1 (−42.2 to −18.5)	<0.001
Vital capacity (L)		2.75 (0.89)	4.06 (1.24)	−1.31 (−1.92 to −0.71)	<0.001
Vital capacity (% predicted)		79.1 (24.3)	111.9 (17.3)	−32.7 (−44.1 to −21.4)	<0.001
Inspiratory capacity (L)		2.47 (0.79)	3.56 (1.01)	−1.09 (−1.76 to −0.43)	0.002
Inspiratory capacity (% pred)		80.1 (19.5)	101.0 (13.7)	−20.8 (−33.3 to −8.4)	0.002

All p values calculated using Student’s t-test.

PEF, peak expiratory flow; VC, slow vital capacity.