TABLE 2

Univariate meta-regression of study characteristics

Studies nPooled recurrence rate % (95% CI)p-value for differenceResidual I2 %
Study sample size n
 <1001828.8 (21.7–36.0)0.23494.05
 >1001137.0 (28.4–46.6)
Publication year
 Before 2000626.3 (11.5–41.1)0.32494.05
 After 20002333.6 (27.8–39.4)
Pneumothorax type
 First1835.7 (27.9–43.5)0.27394.02
 First and recurrent623.4 (16.7–30.1)
 Not stated529.4 (17.0–41.8)
Follow-up period months
 <241026.5 (17.7–35.2)0.30393.84
 >241535.9 (27.9–43.9)
 Not stated431.9 (18.4–45.4)
Type of study
 Nonrandomised2531.7 (26.3–37.1)0.72993.91
 Randomised435.4 (18.7–52.1)