Table 2 Prevalences of the 11 outcomes.

Study	Prevalence within each study (%)
	Standard deviation of area‐level prevalences within study (%)
	Wheeze	Asthma	Bronchitis	Phlegm	Nocturnal cough	Morning cough	Sensitivity to inhaled allergens	Hay fever	Itchy rash	Woken by wheeze	Allergy to pets
Russia	13.40	1.88	14.72	7.15		11.35	6.44	1.21		4.36
	2.6	1.1	3.7	1.7		2.7	2.4	1.0		1.2
Austria	13.55	8.59			10.42	5.30	12.78	5.24	8.17		5.81
	2.1	3.5			2.1	1.4	2.5	2.1	2.1		1.6
Switzerland	10.37	8.98	18.25		21.54	11.90	13.73	10.15	13.29	4.64	4.56
	2.1	2.2	7.8		9.8	4.1	2.1	2.5	2.5	1.3	1.2
Netherlands	9.54	8.14	7.92	9.54	21.58		15.22	7.19	22.26	4.93	9.30
	3.6	4.1	3.7	4.1	6.5		5.7	3.2	5.3	2.4	4.1
Italy	6.72	9.00	12.43	5.53	15.73		10.92	7.81	14.16	1.82	1.82
	1.2	2.5	4.4	1.6	2.5		2.2	2.3	2.8	1.0	1.1

Gaps occur where outcomes were not measured by all studies.