Table 3 Pre- and post-shift lung function in laminators and non-laminators

Respiratory symptoms, n (%)

 Morning cough in winter

6 (21.4)

7 (10.8)

0.306

 Coughing throughout the day in winter

8 (28.6)

6 (16.2)

0.230

 Cough > 3 months per year

4 (14.3)

5 (13.5)

1.000

 Morning phlegm in winter

1 (3.6)

8 (21.6)

0.067

 Coughing up phlegm throughout the day in winter

2 (7.1)

5 (13.5)

0.689

 Phlegm > 3 months per year

0 (0)

6 (16.2)

0.033

 Having a period of cough and phlegm lasting > 3 weeks in the past 3 years

7 (25.0)

8 (21.6)

0.749

 Having > 1 periods of cough and phlegm lasting > 3 weeks in the past 3 years

1 (3.6)

7 (18.9)

0.124

 Breathlessness

3 (10.7)

7 (18.9)

0.495

 Wheezing in the past one year

0 (0)

2 (5.4)

0.502

 Shortness of breath with wheezing

0 (0)

2 (5.4)

0.502

Spirometry testing

 FVC, mean ± SD, % of prediction

98.3 ± 10.8

88.9 ± 12.3

0.002

 FEV1, mean ± SD, % of prediction

90.5 ± 8.6

79.4 ± 10.8

< 0.0001

 FEV1/FVC, mean ± SD, %

84.3 ± 5.6

81.1 ± 7.1

0.053

 Obstructive, n (%)

0 (0)

6 (16.2)

0.033

 Restrictive, n (%)

1 (3.6)

6 (16.2)

0.130

 Obstructive or restrictive, n (%)

1 (3.6)

12 (32.4)

0.004