As the type of surgical incision was separated as cardiothoracic and noncardiothoracic to investigate the POPC among these subgroups, there was no difference in groups (P = 0.25).
The most frequent pulmonary complications in patients with POPC were respiratory tract infection (13%), respiratory failure (59%), pleural effusion (45%), and atelectasis (42%).
The effect of the variables on POPC was investigated by "Multiple Binary Logistic Regression.
The probability of having POPC for those with COPD was observed as 2.5 (184.108.40.206) times higher than those without COPD.
POPC were seen in 58.2% of those with RI changes in the chest X.ray, in 53.8% of those with COPD, in 70.0% of those with a history of upper respiratory tract infection in the preoperative period, in 2.4% of those with thoracic surgery, in 59.1% of those with cardiac surgery, in 40.5% of those with shortness of breath, and in the 22.4% of those with snoring.
SFT (obstructive/restrictive) and FEV1 reduction showed no correlation with POPC (P = 0.27, P = 0.564, respectively).
In the present study, POPC was found in 32.6% of the study group.
Most common POPC is respiratory failure characterized by impaired pulmonary gas change.
 In our study, the most common complications for the patients with POPC were respiratory failure (%59), pleural effusion (45%), atelectasis (42%), and respiratory tract infection (13%).
Smoking history has been reported as an independent risk factor for POPC. [11,12] However, in our study, smoking history is not associated with POPC.
Many studies indicated that POPC such as postoperative pneumonia and prolonged mechanical ventilation is more common in patients receiving general anesthesia.
 In our study, a relationship between ASA classification and POPC was determined.