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

BMC Pulmonary Medicine

Table 5 Percentage predicted values of spirometric parameters in agricultural workers (n = 288) compared with their controls (n = 288)

Parameters	Agricultural workers Mean ± SD	Control subjects Mean ± SD	p-value
FVC	87.20 ± 30.18	95.62 ± 33.64	0.002*
FEV₁	79.14 ± 28.08	85.66 ± 27.05	0.005*
FEV₁/ FVC	95.43 ± 24.89	97.18 ± 24.77	0.398
FEF_25%	98.90 ± 20.83	104.29 ± 22.41	0.003*
FEF_50%	87.48 ± 28.59	92.90 ± 28.50	0.023*
FEF_75%	93.79 ± 41.14	97.55 ± 37.89	0.254
FEF_25–75%	81.69 ± 30.76	86.70 ± 30.92	0.052
PEFR	55.37 ± 19.21	72.18 ± 20.39	< 0.001*

Note: FVC Forced Vital Capacity, FEV1 Forced Expiratory Volume in first second, FEF Forced Expiratory Flow, PEFR Peak Expiratory Flow Rate, SD standard deviation, Numerical data in * indicates the level of significance (p < 0.05)

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