The all age asthma cohort (ALLIANCE) - from early beginnings to chronic disease: a longitudinal cohort study

BMC Pulmonary Medicine

Table 3 Baseline demographics of study participants (cases and controls) in the DZL All Age Asthma Cohort (ALLIANCE)

Demographic data – Paediatric Arm, N = 540	Median	Interquartile range
Age at baseline study date, yrs	6.6	3.1–11.4
	Number	Proportion (%)
Sex, male	341	63.1
Current smoker^a	2	0.9
Demographic data – Adult Arm, N = 255	Median	Interquartile Range
Age at baseline study date, yrs	52.0	43.0–64.0
	Number	Proportion (%)
Sex, male	117	45.9
Smoker^b	60	23.5
Non-smoker^b	195	76.5

^aIn the pediatric arm only children aged 8 years or more were asked for their smoking habits (n = 224). Data were missing for n = 12 children
^bIn the adult arm current smokers and former smokers with at least 10 pack years (PY) smoking history were defined as ‘smokers’ (n = 16 (26.7%) and n = 44 (73.3%), respectively); non-smokers could be either never-smokers, or former smokers with less than 10PY. Among all adult former smokers and current smokers, mean (range) cumulative tobacco exposure was 9.5 PY (4–20)

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