Table 4 Changes in sumscore* of five respiratory symptoms among workers in the hospitality business, before and after the enaction of a public smoking ban. Separate analyses of variance with repeated measures for each independent variable.

	n	Baseline sumscore	Follow‐up sumscore	Difference	p Value (within subjects)†	p Value (between subjects)
Sex					0.613	0.133
Women	439	1.67	1.57	0.11
Men	422	1.76	1.63	0.13
Age					0.712	0.236
15–29	325	1.76	1.65	0.11
30–39	259	1.69	1.59	0.10
40+	277	1.69	1.54	0.15
Educational level					0.281	0.540
Primary	146	1.66	1.55	0.11
Secondary	481	1.75	1.60	0.15
University	234	1.68	1.62	0.06
Personal smoking habits					<0.001	<0.001
Non‐smokers	327	1.44	1.29	0.15
Smokers	458	1.91	1.85	0.06
Quitters	48	1.85	1.30	0.55
Starters	28	1.56	1.53	0.03
Percentage of guests who usually smoked before ban					0.599	0.002
Less than 50%	230	1.58	1.48	0.10
50% or more	626	1.77	1.64	0.13
Time spent in an exposed environment					0.387	0.011
No degree	24	1.51	1.32	0.19
Small degree	161	1.61	1.57	0.04
Some degree	183	1.62	1.52	0.10
Large degree	492	1.80	1.65	0.15
Personal attitude towards ban before ban					0.001	0.004
Negative	246	1.78	1.78	0.00
Neutral	187	1.67	1.62	0.06
Positive	427	1.70	1.48	0.21
Total (main effect)	861	1.72	1.60	0.12	<0.001

*The sumscore is based on a graded response regarding degrees of having five respiratory symptoms.

†Interaction between within subjects effects and predictors, without control for other predictors.