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Table 1 Socioeconomic and lifestyle characteristics and mean value of anthropometric measurements among the study population

From: Socioeconomic variations in chronic obstructive pulmonary disease prevalence, diagnosis, and treatment in rural Southwest China

Characteristicn (%) or \( \overline{X}\pm S \)
Gender
 Male3606 (47.9)
 Female3928 (52.1)
Age
 35–39 years285 (3.8)
 40–49 years1484 (19.7)
 50–59 years2001 (26.6)
 60–69 years1872 (24.8)
  ≥ 70 years1892 (25.1)
Ethnicity
 Han2502 (33.2)
 Na Xi2531 (33.6)
 Bai2501 (33.2)
Level of education
 Primary (grade 1–6) or lower4743 (63.0)
 Middle (grade 7–9) or higher2791 (37.0)
Approximate annual household income
 Good (≥$820)3738 (49.6)
 Poor (<$820)3796 (50.4)
Access to medical services
 Good5825 (75.2)
 Poor1874 (24.9)
 Current smokers2291 (30.4)
 Former smokers636 (8.4)
 SHS exposure1588 (30.3)
 Tobacco cultivators689 (9.1)
 Daily indoor exposure to biomass fuel297 (3.9)
 Family history of lung disease89 (1.2)
Spirometry †
 FEV1, L1.7 ± 1.1
 FVC, L2.1 ± 1.1
 FEV1/FVC, %81.6 ± 13.2
Mean BMI (kg/m2, mean ± SD)23.6 ± 3.6
  1. †pre-bronchodilator, SHS secondhand smoke, BMI body mass index, SD standard deviation FEV1 forced expiratory volume in one second, FVC forced vital capacity