Incidence rates (IRs) per 100 000 individuals of primary spontaneous pneumothorax in Denmark overall and stratified by sex
| Variables | Overall | Female | Male | |||
| Patients | IR (95% CI) | Patients | IR (95% CI) | Patients | IR (95% CI) | |
| Age group | ||||||
| 0–10 years | 0 | 0 | 0 | 0 | 0 | 0 |
| 11–15 years | 36 | 2.1 (1.5–2.9) | 2 | 0.2 (0.1–0.8) | 34 | 3.9 (2.8–5.5) |
| 16–20 years | 278 | 15.6 (9.5–25.6) | 22 | 2.5 (1.6–3.8) | 256 | 28.1 (24.9–31.8) |
| 21–25 years | 242 | 14.2 (8.4–23.9) | 28 | 3.3 (2.3–4.8) | 214 | 24.7 (21.6–28.2) |
| 26–30 years | 182 | 11.5 (6.5–20.5) | 28 | 3.6 (2.5–5.2) | 154 | 19.3 (16.5–22.6) |
| 31–35 years | 166 | 9.6 (5.1–18.1) | 36 | 4.2 (3.0–5.8) | 130 | 15.0 (12.6–17.8) |
| 36–40 years | 124 | 6.5 (3.0–14.0) | 34 | 3.5 (2.5–4.9) | 90 | 9.3 (7.6–11.4) |
| Overall | 1028 | 7.3 (6.9–7.8) | 150 | 2.2 (1.9–2.6) | 878 | 12.3 (11.5–13.1) |
| Year | ||||||
| 2009–2010 | 168 | 6.0 (5.2–6.9) | 26 | 1.9 (1.3–2.8) | 142 | 10.0 (8.5–11.8) |
| 2010–2011 | 196 | 7.0 (6.1–8.1) | 20 | 1.4 (0.9–2.2) | 176 | 12.3 (10.6–14.3) |
| 2011–2012 | 198 | 7.1 (6.2–8.2) | 38 | 2.8 (2.0–3.8) | 160 | 11.2 (9.6–13.1) |
| 2012–2013 | 248 | 8.7 (7.7–9.6) | 26 | 1.9 (1.3–2.8) | 222 | 15.6 (13.7–17.8) |
| 2013–2014 | 218 | 8.2 (7.2–9.4) | 40 | 2.9 (2.1–4.0) | 178 | 12.5 (10.8–14.5) |