Chronic respiratory symptoms and pulmonary function status in Ethiopian agricultural workers: a comparative study

BMC Pulmonary Medicine

Table 6 Univariate simple and multiple linear regression model examining the association between spirometric parameters and duration of workplace exposure (years) in agricultural workers (n = 288)

Parameters	Simple linear regression model			Multiple linear regression model
Parameters	Beta coefficient	95% CI	p-value	Beta coefficient	95% CI	p- value
FVC (L)	−0.023	− 0.037, − 0.010	< 0.001*	−0.019	− 0.031, − 0.007	0.003*
FEV₁ (L)	− 0.020	−0.031, − 0.009	< 0.001*	−0.020	− 0.030, − 0.010	< 0.001*
FEV₁/ FVC (%)	−0.071	− 0.251, 0.110	0.442	− 0.165	−0.355, 0.024	0.087
FEF_25%(L/s)	−0.033	−0.057, − 0.008	0.010*	−0.039	− 0.064, − 0.014	0.003*
FEF_50%(L/s)	− 0.033	−0.052, − 0.014	0.001*	−0.037	− 0.056, − 0.017	< 0.001*
FEF_75% (L/s)	−0.018	− 0.029, − 0.007	0.002*	−0.020	− 0.031, − 0.008	0.001*
FEF_25–75% (L/s)	−0.028	− 0.045, − 0.011	0.002*	−0.032	− 0.049, − 0.014	< 0.001*
PEFR (L/s)	−0.025	− 0.050, 0.000	0.046*	− 0.031	−0.056, − 0.006	0.015*

Note: CI Confidence interval for beta coefficient, FVC Forced vital capacity, FEV1 Forced Expiratory Volume in first second, FEF Forced expiratory flow, PEFR Peak Expiratory Flow Rate, L liter, S second, Numerical data in * indicates the level of significance (p < 0.05). A multiple regression model was controlled for sex, educational status and BMI. Age was not included in the model due to the issue of multicollinearity

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