Table 1

Patient characteristics

Primary spontaneous pneumothoraxSecondary spontaneous pneumothorax
Data are expressed per episode.
*p<0.05 compared to primary spontaneous pneumothorax; see text for details.
†In two patients with primary spontaneous pneumothorax, there was a history of a previous ipsilateral and previous contralateral episode.
NR: information not recorded.
No of episodes4514
No of patients4212
Median (range) age (years)28 (14–59)*57 (23–75)
Male/female38/79/5
History of cigarette smoking
    Yes (current/ex)2910
    No91
    NR73
Symptoms (%)
    Breathlessness33 (73)11 (79)
    Chest pain44 (98)*10 (71)
    Cough8 (18)*7 (50)
Duration of symptoms (%)
    ≤24 hours24 (53)6 (43)
    >24 hours7 (16)3 (21)
    NR14 (31)5 (36)
History of previous spontaneous pneumothorax (%)21 (47)8 (57)
    †Ipsilateral147
    †Contralateral51
    NR40