Pilot Study on the Impact of Biogas as a Fuel Source on Respiratory Health of Women on Rural Kenyan Smallholder Dairy Farms

Table 5

Multivariable linear regression model of percent predicted FEV₁, for Kenyan farmwomen.

Variable	Coefficient	Standard; error	𝑃 value	95% CI
Family size	−0.02	0.01	0.02	−0.04, −<0.01
Milk income
<5000 KSH	referent	—	—	—
≥5000 KSH	−0.07	0.03	0.03	−0.14, −0.01
Constant	1.02	0.04	<0.01	0.95, 1.10