Needle aspiration as 1^{st}intervention (n=6) | ICT drainage as 1^{st}intervention (n=10) | P value | |

Age, years, median(IQR) | 30 (25-32) | 32.5 (29-38) | >0.99 |

Smoking history Never smoked, n(%) Ex-smokers, n(%) Current smokers, n(%) | 1 (17%) 2 (33%) 3 (50%) | 3 (30%) 1 (10%) 6 (60%) | >0.99 0.51 >0.99 |

Symptoms Chest pain, n (%) Dyspnoea, n (%) | 5 (83%) 4 (67%) | 8 (80%) 10 (100%) | >0.99 0.125 |

Length of stay, days, median(IQR) | 5.5 (4-10) | 9 (4-13) | - |

Successful lung re-expansion, n(%) | 0 | 6 (60%) | 0.03 |

Requiring surgical intervention, n(%) | 2 (33%) | 4 (40%) | >0.99 |

Categorical variables shown as n(%), comparisons made with Fisher’s exact test;

Continuous variables shown as median (25

^{th}– 75^{th}percentile), comparisons made with Wilcoxon signed rank test.