Table 2.

Univariate and multivariate conditional logistic regression analyses of potential risk factors for consulting the general practitioner with an acute respiratory tract infections.

Potential risk factor	Case patients n/N (%)	Control patients n/N(%)	Crude OR* [95%CI]*	Adjusted OR** [95%CI]
Exposure to respiratory complaints within household
No	168/283 (59)	218/283 (77)	1	1
Yes	115/283 (41)	65/283 (23)	2.32 [1.58–3.39]	1.91 [0.96–3.78]
Exposure to respiratory complaints outside household
No	112/330 (34)	208/330 (63)	1	1
Maybe	87/330 (26)	47/330 (41)	3.40 [2.17–5.37]	3.85 [1.66–8.93]
Yes	131/330 (40)	75/330 (23)	3.50 [2.31–5.29]	3.65 [1.70–7.84]
Number of children in household
0	166/340 (49)	184/340 (54)	1	1
≥1	174/340 (51)	156/340 (46)	1.37 [0.95–1.98]	1.42 [0.51–3.95]
Children in primary school
No	137/220 (62)	151/220 (69)	1	1
Yes	83/220 (38)	69/220 (31)	1.52 [0.93–2.47]	1.12 [0.43–2.91]
Children in secondary education
No	166/217 (76)	153/217 (71)	1	1
Yes	51/217 (24)	64/217 (29)	0.67 [0.41–1.10]	0.32 [0.13–0.77]
Dampness or mould at home
No	266/313 (85)	244/313 (78)	1	1
Yes	47/313 (15)	69/313 (22)	0.63 [0.42–0.95]	0.48 [0.23–1.00]
Mechanical ventilation system
No	138/333 (41)	163/333 (49)	1	1
Yes	195/333 (59)	170/333 (51)	1.36 [1.00–1.86]	1.31 [0.75–2.27]
Smoking by participant
No	180/354 (51)	184/354 (52)	1	1
In past	85/354 (24)	78/354 (22)	1.14 [0.75–1.74]	1.25 [0.56–2.80]
Yes	89/354 (25)	92/354 (26)	1.00 [0.67–1.49]	0.91 [0.40–2.07]
Exposure to passive smoking
No	230/355 (65)	221/355 (62)	1	1
Yes	125/355 (35)	134/355 (38)	0.89 [0.65–1.22]	0.56 [0.27–1.13]

^# GP = general practitioner

^## ARTI = acute respiratory tract infections

* OR = odds ratio; CI = confidence interval

** adjusted for all variables and sex