Reproducibility of diaphragm thickness measurements by ultrasonography in patients on mechanical ventilation

Table 1 Baseline characters of the study population

Classification	Quantity, n (%)
Mean age, yr	54.5 ± 15.3
Male sex	45 (70)
Diagnoses
COPD	20 (31)
Post tuberculosis sequelae	11 (17)
Interstitial lung disease	8 (13)
Asthma	5 (8)
Lung cancer	5 (8)
Others1	15 (23)
Mean apache II score at admission	15.5 ± 5.3
Mean diaphragm thickness at FRC (mm)	2.29 ± 0.4

¹Other diagnoses included chronic obstructive pulmonary disease, obstructive sleep apnea overlap syndrome, aspiration pneumonia, diabetic ketoacidosis and acute respiratory distress syndrome. COPD: Chronic obstructive pulmonary disease; FRC: Functional residual capacity.