Health-related quality of life decreases in young people with asthma during the transition from adolescence to young adulthood: a birth cohort study

Table 1 Distribution of selected background characteristics in the BAMSE cohort (N = 4089) and the study population (n = 2268)

Background characteristics	BAMSE cohort N = 4089		Study population n = 2268
Background characteristics	n	%	n	%	(95% CI)
Sex
Female	2,024	49.5	1,265	55.8	(53.7–57.8)
Mother’s age at birth
< 25 years	319	7.8	156	6.9	(5.9–8.0)
Parent born outside Sweden
Yes	718	21.1	426	20.9	(19.2–22.7)
Family history of allergic disease ^a
Yes	1,200	29.7	701	31.2	(29.3–33.1)
Parental education ^b
University	2,161	52.9	1,289	56.8	(54.8–58.9)
Parental smoking ^c
Yes	855	21.0	458	20.3	(18.7–22.0)

^aMother and/or father with doctor’s diagnosis of asthma and asthma medication and/or doctor’s diagnosis of hay fever in combination with reported allergy to furred pets and/or pollen at the time of baseline questionnaire
^bAt least university or college degree/education
^cAny of the parents smoked at least one cigarette per day at the time of the baseline questionnaire

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