All patients before ttt	PH		PCO₂		HCO₃		PO₂		SO₂
All patients before ttt	R	P-value	R	P-value	R	P-value	R	P-value	R	P-value
Heart rate	−0.115	0.479	0.069	0.672	0.136	0.403	−0.247	0.124	−0.327	0.039
Respiratory rate	0.493	0.001	−0.680	0.000	−0.550	0.000	0.117	0.472	0.180	0.268
After Venturi mask
Heart rate	−0.218	0.367	0.109	0.646	0.413	0.071	−0.638	0.002	−0.657	0.002
Respiratory rate	0.688	0.001	−0.908	0.000	−0.626	0.003	0.238	0.313	0.223	0.345
WBCs thous/cmm	−0.393	0.086	0.518	0.019	0.296	0.205	−0.382	0.096	0.418	0.067
After CPAP mask
Respiratory rate	0.384	0.095	−0.651	0.002	−0.256	0.275	0.096	0.686	0.162	0.598
Diastolic blood pressure	0.117	0.622	−0.497	0.026	−0.258	0.272	0.355	0.124	0.350	0.130