Table 2.

Effect of the presence or absence of special weather conditions on the rate of pneumothorax after CT-guided lung biopsy.

Characteristic	Pneumothorax Absent	Pneumothorax Present
None	135/215 (63%)	80/215 (37%)
Thunderstorm	0 (0%)	0 (0%)
Rainfall	77/109 (71%)	32/109 (29%)
Snow	11/14 (79%)	3/14 (21%)

Note: Data are fractions of patients, percentages in parentheses. p = 0.241 (from the Fisher exact test of the association of rate of pneumothorax with the presence or absence of special weather conditions).