Bulletin of Faculty of Physical Therapy

Table 3 Mean pH, PaCO₂, PaO₂, and HCO₃ pre- and post-treatment of the study and control groups

From: Effect of cough assist device on blood gasses and period of mechanical ventilator for pneumonic children with general hypotonia

	Study group	Control group
	Mean ± SD	Mean ± SD	MD	t value	p value
pH
Pre treatment	7.41 ± 0.03	7.42 ± 0.02	− 0.01	− 1.13	0.26
Post treatment	7.38 ± 0.02	7.39 ± 0.01	− 0.01	− 1.21	0.23
MD	0.03	0.03
% of change	0.4	0.4
t value	2.99	2.42
	*p = 0.01*	*p = 0.03*
PaCO₂ (mmHg)
Pre-treatment	49.66 ± 6.4	48.13 ± 7.68	1.53	0.59	0.55
Post-treatment	30.66 ± 5.62	32.46 ± 6.7	− 1.8	− 0.79	0.43
MD	19	15.67
% of change	38.26	32.56
t value	9.98	6.28
	*p = 0.001*	*p = 0.001*
PaO₂ (mmHg)
Pre-treatment	97 ± 11.61	94 ± 10.11	− 3.4	− 0.85	0.4
Post-treatment	124.06 ± 9.21	104.8 ± 8.95	− 19.26	− 5.8	0.001
MD	− 26.66	− 10.8
% of change	27.37	11.49
t value	− 11.6	− 6.51
	*p = 0.001*	*p = 0.001*
HCO₃ (mmol/l)
Pre-treatment	29 ± 3.12	28.85 ± 4.65	0.15	0.1	0.92
Post-treatment	20.22 ± 4.77	21.5 ± 3.6	− 1.28	− 0.83	0.41
MD	8.78	7.35
% of change	30.28	25.48
t value	7.3	7.92
	*p = 0.001*	*p = 0.001*

SD standard deviation, MD mean difference; p value, probability

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