. 2022 Aug 25;130(8):087008. doi: 10.1289/EHP10734

Table 2.

Association between exposure to residential wood burning and pulmonary function among $lowercase italic n equals 2815$ participants in the Agricultural Lung Health Study (2009–2013).

Residential wood burning exposure	$n$	$uppercase f e v begin subscript 1 end subscript$ (mL)	$uppercase f e v begin subscript 1 end subscript$ (mL)	FVC (mL)	FVC (mL)	$uppercase f e v begin subscript 1 end subscript per uppercase f v c$ (%)	$uppercase f e v begin subscript 1 end subscript per uppercase f v c$ (%)
Residential wood burning exposure	$n$	Mean^a ± SD	Beta^b (95% CI)	Mean^a ± SD	Beta^b (95% CI)	Mean^a ± SD	Beta^b (95% CI)
Unexposed	2,217	2,666 ± 813	Ref	3,584 ± 1,007	Ref	74 ± 8	Ref
Some	250	2,660 ± 783	$negative 3$ ( $negative 78$ , 72)	3,595 ± 1,019	30 ( $negative 61$ , 122)	74 ± 8	$negative 0.2$ ( $negative 1$ , 0.9)
Frequent	348	2,661 ± 813	$negative 5$ ( $negative 73$ , 63)	3,605 ± 1,013	$negative 12$ ( $negative 92$ , 68)	74 ± 9	$negative 0.4$ ( $negative 1$ , 0.6)

Note: CI, confidence interval; FEV₁, forced expiratory volume in 1 s; FVC, forced vital capacity; Ref, reference; SD, standard deviation.

^{^a}

Mean ± SD columns are sample weighted averages that account for the oversampling of individuals with asthma from the parent cohort. These are based on crude values not adjusted for age, gender, height, or any other covariates.

^{^b}

Beta estimates represent the difference in mean response between an individual exposed to wood burning vs. unexposed individuals, holding all covariates constant. Analyses conducted using sample weighted linear regression, adjusting for age, $age begin superscript 2 end superscript$ , gender, height, $height begin superscript 2 end superscript$ , weight (for FVC only), race/ethnicity, state, smoking status, and pack-years. In parentheses are lower and upper bounds for 95% confidence intervals.