Table 1.
Baseline characteristics by treatment allocation
| Patients receiving ambulatory care (n=117) | Patients receiving standard care (n=119) | ||
|---|---|---|---|
| Gender | |||
| Female | 21 (18%) | 22 (18%) | |
| Male | 96 (82%) | 97 (82%) | |
| Age (mean [SD]) | 31 (8) | 30 (9) | |
| Ethnicity | |||
| Asian | 2 (2%) | 5 (4%) | |
| Black, African, or Caribbean | 1 (1%) | 3 (3%) | |
| Mixed or multiple ethnicity | 1 (1%) | 1 (1%) | |
| Other | 1 (1%) | 2 (2%) | |
| Unknown | 1 (1%) | 1 (1%) | |
| White | 111 (95%) | 107 (90%) | |
| Hours of pneumothorax before admission* | |||
| Median (IQR) | 15 (4–72); n=105 | 23 (5–48); n=112 | |
| Mean (SD) | 59 (132); n=105 | 58 (147); n=112 | |
| Size of pneumothorax | |||
| <4 cm | 49 (42%) | 49 (41%) | |
| ≥4 cm | 68 (58%) | 70 (59%) | |
| Side of pneumothorax | |||
| Right | 63 (54%) | 68 (57%) | |
| Left | 54 (46%) | 51 (43%) | |
| Chest pain | |||
| Yes | 104 (89%) | 109 (92%) | |
| No | 13 (11%) | 10 (8%) | |
| Shortness of breath | |||
| Yes | 104 (89%) | 106 (89%) | |
| No | 13 (11%) | 13 (11%) | |
| Previous procedure to treat pneumothorax | |||
| No | 96 (82%) | 106 (89%) | |
| Yes | 21 (18%) | 13 (11%) | |
| Previous pneumothorax | |||
| No | 90 (77%) | 87 (73%) | |
| Yes | 26 (22%) | 32 (27%) | |
| Missing data | 1 (1%) | .. | |
| Previous other lung disease | |||
| No | 109 (93%) | 113 (95%) | |
| Yes | 5 (4%) | 6 (5%) | |
| Unknown | 1 (1%) | .. | |
| Missing data | 2 (2%) | .. | |
| Cardiovascular disease | |||
| No | 113 (97%) | 100 (100%) | |
| Yes | 3 (3%) | .. | |
| Missing | 1 (1%) | .. | |
| Renal disease | |||
| No | 115 (98%) | 117 (98%) | |
| Yes | 1 (1%) | 2 (2%) | |
| Missing | 1 (1%) | .. | |
| Family history of pneumothorax | |||
| No | 100 (85%) | 100 (84%) | |
| Yes | 7 (6%) | 13 (11%) | |
| Unknown | 8 (7%) | 6 (5%) | |
| Missing | 2 (2%) | .. | |
| Tobacco smoking status | |||
| Current smoker | 61 (52%) | 56 (47%) | |
| Ex-smoker | 18 (15%) | 26 (22%) | |
| Never smoked | 35 (30%) | 37 (31%) | |
| Missing | 2 (2%) | .. | |
| Unknown | 1 (1%) | .. | |
| Marijuana smoking status | |||
| Never smoked | 57 (49%) | 55 (46%) | |
| Current smoker | 35 (30%) | 31 (26%) | |
| Ex-smoker | 20 (17%) | 28 (24%) | |
| Unknown | 3 (3%) | 5 (4%) | |
| Missing | 2 (2%) | .. | |
| Tobacco smoking pack-years for current and previous smokers (median [IQR]) | 8 (5–12); n=74 | 7 (5–11); n=78 | |
Data are n (%) unless otherwise indicated.
*
Not all patients had available data.