Table 3 Prevalence (%) of respiratory symptoms among workers in the hospitality industry before and after the smoking ban.

		Before smoking ban	After smoking ban	Difference	McNemar*
Morning	Smokers	28.5	25.9	−2.6	0.29
cough	Non‐smokers	10.6	4.9	−5.8	<0.01
	Former smokers	20.8	2.1	−18.8	0.00
Daytime	Smokers	28.9	32.0	3.1	0.24
cough	Non‐smokers	14.9	7.3	−7.6	<0.01
	Former smokers	27.1	8.3	−18.8	0.01
Phlegm	Smokers	18.3	17.4	−0.9	0.74
cough	Non‐smokers	9.8	5.2	−4.6	0.01
	Former smokers	20.8	4.2	−16.7	0.02
Dyspnoea	Smokers	25.4	19.8	−5.7	0.01
	Non‐smokers	10.7	5.2	−5.5	<0.01
	Former smokers	20.8	6.3	−14.6	0.07
Wheezing	Smokers	12.4	12.4	0.0	1.00
	Non‐smokers	4.3	2.7	−1.5	0.36
	Former smokers	14.6	0.0	−14.6	0.02
Any	Smokers	50.1	48.2	−2.0	0.49
symptom	Non‐smokers	26.4	14.6	−11.9	<0.01
	Former smokers	50.0	16.7	33.3	<0.01

*Exact McNemar significance probability.