Table 4.

Univariate and multivariate regression analyses to identify predictors for recurrence after doxycycline treatment

Variable	OR (95% CI)	Model I AOR (95% CI)	Model II AOR (95% CI)
Diagnosis of SP (recurrent)	3.398 (1.061 to 10.878)*	4.054 (1.168 to 14.076)*	3.486 (1.004 to 12.001)*
Weight<55 (kg)	3.410 (1.030 to 11.291)*	4.053 (1.134 to 14.494)*
Height/weight, ≥3.25 (cm/kg)	4.872 (1.479 to 16.047)**		4.970 (1.435 to 17.213)*

For model I construction, diagnosis of SP and weight were included for analysis. For model II construction, diagnosis of SP and height/weight were included for analysis.

*p<0.05, ^**p<0.01.

SP, spontaneous pneumothorax, AOR=adjusted OR.