Main effect season	Less symptoms	More symptoms	Most symptoms	Main effect age	Interaction season*age	Main effect allergy in the family	Main effect frequent infections in the family	Main effect smoking in the house
A
Cough	X	Summer	Spring = autumn	Winter	0	0	X	0	0
Blocked nose	X	Summer	Spring = autumn	Winter	0	0	0a	0	0
Runny nose	X	Summer	Spring = autumn	Winter	X	0	0	0	0
Headache	X	Summer	Spring = autumn	Winter	0	0	0	0	0
Throat ache	X	Summer = spring	Autumn	Winter	0	0	0	0	0
Dyspnea	X	Summer = spring	(Autumn)b	Winter	0	0	0	0	0
Ear discharge	X	Summer = spring	(Autumn)b	Winter	0	0	0a	0	0
Earache	X	Summer = spring = autumn		Winter	0	0	0	0	0
Hoarse voice	X	Summer = spring = autumn		Winter	0	0	0	0	0