Table 2– The proportion of participants with information who reported their asthma attacks occurred at specific bimonthly periods of the year and the adjusted odds ratio of reporting that asthma attacks usually occur in a given bimonthly period by country^#

Country	Asthma attacks at specific bimonthly periods %	OR Jan/Feb	OR March/April	OR May/June	OR July/Aug	OR Sept/Oct	OR Nov/Dec
Spain	86	1.00	1.54	0.94	0.47	0.90	1.11
Italy	85	1.00	1.54	2.44	1.10	0.81	0.81
France	70	1.00	0.97	1.06	0.74	0.67	0.88
Switzerland	70	1.00	1.74	2.36	1.18	1.07	0.97
Germany	76	1.00	1.05	1.15	0.95	1.05	1.15
Belgium	67	1.00	1.57	2.35	1.79	2.05	1.91
The Netherlands	75	1.00	1.00	0.37	0.34	0.85	1.09
Ireland	79	1.00	0.35	0.44	0.82	0.74	1.11
UK	61	1.00	0.63	0.84	0.97	0.72	1.00
Sweden	47	1.00	1.09	1.48	1.04	0.91	1.09
Norway	50	1.00	0.86	0.74	1.18	0.86	0.74
USA	72	1.00	0.83	2.38	1.00	1.06	0.89
Canada	79	1.00	0.70	0.81	0.80	0.79	0.91
New Zealand^¶	70	1.00	0.71	0.45	0.37	0.44	1.00
Australia^¶	59	1.00	1.66	1.07	0.77	0.59	0.81

Odds ratio coefficients from generalised estimating equations models controlling for repeated individual observations, sex and age. ^#: without consideration of sensitisation to aeroallergen; ^¶: bimonthly periods have been shifted 6 months forward to allow comparison with the northern hemisphere. Statistically significant results (p<0.05) are shown in bold.