Table 2.
Age-standardised prevalences of PRISm, pre-COPD, young COPD, and mild COPD in general Chinese population, separately for males and females, and stratified by age categories.
| Prevalence (%) | PRISm |
Pre-COPD |
Young COPD |
Mild COPD |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total | Males | Females | Total | Males | Females | Total | Males | Females | Total | Males | Females | |
| In entire population | 5.5 (4.3–6.9) | 5.9 (4.3–8.0) | 5.1 (4.1–6.3) | 7.2 (5.9–8.8) | 7.5 (6.2–9.2) | 6.9 (5.4–8.8) | 1.1 (0.7–1.8) | 1.4 (0.9–2.2) | 0.8 (0.5–1.4) | 3.1 (2.5–3.8) | 4.4 (3.5–5.6) | 1.7 (1.5–2.0) |
| By age categories (years) | ||||||||||||
| 20–29 | 7.6 (6.0–9.5) | 7.4 (5.4–10.0) | 7.8 (6.0–10.0) | 3.4 (2.5–4.6) | 3.5 (2.4–5.0) | 3.3 (2.3–4.8) | 0.9 (0.3–2.2) | 0.9 (0.3–2.7) | 0.8 (0.4–1.9) | 0 | 0 | 0 |
| 30–39 | 5.2 (3.9–6.8) | 5.7 (4.1–7.9) | 4.6 (3.3–6.4) | 5.3 (3.8–7.3) | 6.0 (3.8–9.4) | 4.6 (3.1–6.8) | 0.7 (0.4–1.2) | 0.7 (0.3–1.7) | 0.6 (0.3–1.1) | 0 | 0 | 0 |
| 40–49 | 5.5 (3.8–7.8) | 6.6 (3.9–11.0) | 4.3 (3.1–5.9) | 8.9 (6.6–11.7) | 10.2 (7.4–14.0) | 7.4 (5.4–10.2) | 1.7 (1.1–2.7) | 2.5 (1.7–3.6) | 1.0 (0.5–1.8) | 0 | 0 | 0 |
| 50–59 | 4.1 (3.2–5.3) | 3.9 (2.7–5.4) | 4.4 (3.5–5.6) | 9.9 (7.5–12.9) | 10.4 (7.8–13.7) | 9.4 (7.1–12.5) | NAa | NAa | NAa | 5.2 (4.2–6.3) | 7.4 (6.0–9.3) | 2.8 (2.2–3.5) |
| 60–69 | 3.6 (2.4–5.2) | 3.9 (2.7–5.6) | 3.2 (2.0–5.1) | 10.0 (7.6–12.9) | 9.7 (7.4–12.6) | 10.3 (7.1–14.7) | 0 | 0 | 0 | 10.8 (8.9–13.0) | 15.5 (12.4–19.1) | 5.9 (4.5–7.7) |
| ≥70 | 5.5 (3.6–8.4) | 6.6 (3.7–11.6) | 4.6 (3.2–6.4) | 10.0 (8.2–12.1) | 7.1 (6.0–8.4) | 12.5 (9.1–16.8) | 0 | 0 | 0 | 15.7 (10.8–22.3) | 22.8 (15.1–32.8) | 9.4 (6.9–12.6) |
| p value | 0.0003 | 0.0052 | 0.0027 | <0.0001 | 0.0001 | <0.0001 | 0.0038 | 0.0055 | 0.1794 | <0.0001 | <0.0001 | <0.0001 |
The age-standardised prevalences were calculated based on 2010 China population census data, and accounted for study sampling weights. For young COPD, the age-standardised prevalences were calculated for 20–29, 30–39, and 40–49 years categories, based on respective population weights for each age categories. Similar calculations were performed for PRISm, pre-COPD, and mild COPD, respectively.
The prevalence was not calculated for young COPD in the 50-59 years category because the maximum age of young COPD was 50 years, therefore the numbers in this category might not be representative for this age group. COPD = chronic obstructive pulmonary disease. NA = not applicable. PRISm = preserved ratio impaired spirometry.