. Author manuscript; available in PMC: 2020 Mar 20.

Published in final edited form as: Am J Ind Med. 2017 Mar;60(3):255–263. doi: 10.1002/ajim.22680

Table II.

Pulmonary Outcomes at Pre- and Post-Shift Among Dairy Parlor Workers (n = 62)

	Number (%) or mean (SD)
Outcomes	Pre-shift	Post-shift	P-value of the difference between pre and post-shift^*
Pulmonary function measures
FEV₁ (L) (n = 53)	3.69 (0.59)	3.66 (0.61)	0.149
eNO (ppb)	15 (7)	14 (8)	0.005
Self-reported pulmonary symptoms
Cough	19%	7%	0.004
Phlegm	19%	8%	0.227
Wheeze	8%	3%	0.453
Shortness of breath	11%	5%	0.219
Any of the above	40%	23%	0.008

FEV₁, forced expiratory volume in 1 s (in L); eNO, exhaled nitric oxide.

P-value from paired t-test for the difference of means; P-value from McNemar’s chi-squared for paired proportions.