Relationship of systemic IL-10 levels with proinflammatory cytokine responsiveness and lung function in agriculture workers

Table 1 Study Population Characteristics Stratified by Airway Obstruction

	Total N = 625
Age, Mean yrs. (SD)	64.8 (8.3)
Sex, n (%)
Male	612 (97.9)
Female	13 (2.1)
BMI, kg/m², n (%)
< 25	91 (14.6)
25–29.9	182 (29.1)
≥ 30	352 (56.3)
Race, n (%)
White	599 (96.1)
Other	24 (3.9)
Education, n (%)^a
≤ High School	266 (44.2)
> High School	336 (55.8)
Smoking Status, n (%)
Never	124 (19.8)
Former	368 (58.9)
Current	133 (21.3)
COPD	250 (40.0)
Chronic Cough^a	204 (34.1)
Chronic Phlegm^a	206 (34.6)
Chronic Bronchitis^a	142 (24.0)
Lifetime Exposure to Livestock^a	527 (87.3)
Lifetime Exposure to Crops^a	534 (81.9)
Worked on a Farm, Mean yrs. (SD)^a	26.5 (20.9)
White Blood Cell Count × 10³/μl (SD)^a	7.4 (2.1)
Neutrophils^a	4.6 (1.9)
Monocytes^a	0.68 (0.35)
Eosinophils^a	0.23 (0.20)

Abbreviations and Definitions: BMI body mass index, COPD chronic obstructive pulmonary disease, defined as FEV₁/FVC < 0.7; Livestock, hogs, beef and dairy cattle, and poultry; Crops, corn, sorghum, wheat, oats, and hay
^aNumbers do not add up to 100% due to missing data

ISSN: 1465-993X