Table 1

Characteristics of the study population

Drainage group (n=30)No drainage group (n=31)
IQR=interquartile range.
*Risk factors including oral steroid, diabetes mellitus, liver cirrhosis, subtotal gastrectomy and alcoholism.
Mean (SD) age (years)61.5 (17.7)56.6 (22.4)
Median time from onset of symptoms to treatment days (IQR)11 (9–30)8 (7–14)
Patients with risk factors*11 (36%)7 (23%)
Pleuritis combined with pulmonary tuberculosis (%)9 (30%)11 (35%)
Initial amount of pleural effusion