Table 2. Longitudinal analyses on physical activity (PA), sedentary behaviour and current asthma between age 6 and 18 years.

	n (n asthma cases)	n cohorts		aOR (95% CI)*
Questionnaire based
PA (hours/day) age 0–2 years	2024 (282)	2	a	0.91 (0.77 to 1.07)
Age 3–5 years	21 927 (2204)	16	b	1.01 (0.98 to 1.04)
Sedentary behaviour (hours/day) age 0–2 years	2380 (329)	3	c	1.05 (0.80 to 1.37)
Age 3–5 years	21 643 (2180)	15	d	1.03 (0.99 to 1.07)
Accelerometry
Total activity (counts/min) age 3–5 years	775 (131)	2	e	1.00 (1.00 to 1.00)
Sedentary activity age 3–5 years	775 (131)	2	e	1.00 (0.86 to 1.16)
MVPA
Age 3–5 years	775 (131)	2	e	0.99 (0.66 to 1.50)

GeneralizedGeneralised logistic mixed models on questionnaire -based (PA) in hours per day, sedentary behaviour in hours per day, and accelerometry data at ages 0–2 years and 3–5 years; and current asthma at age 6–18 years.

Multivariable analyses corrected for sex, maternal education level, maternal BMI.

Included cohorts: (a) KOALA, STEPS Study, (b) ABCD, ABIS, G21, Generation R, HUMIS, INMA Asturias, INMA Gipuzkoa, INMA Sabadell, INMA Valencia, KOALA, Lifeways, LISA, LucKi, STEPS Study, SWS, Whistler, (c) HUMIS, KOALA, STEPS Study, (d) ABCD, ABIS, G21, Generation R, HUMIS, INMA Asturias, INMA Gipuzkoa, INMA Sabadell, INMA Valencia, KOALA, Lifeways, LISA, LucKi, STEPS Study, SWS. : KOALA, SWS.

^* (aORs) indicate the increase in odds of current asthma between age 6 and 18 years for each hour per day of parent reported PA or sedentary behaviour in the age periods between age 0 and 2 or 3 and 5 years; and time in sedentary activity or moderate to vigorous (MVPA) recorded by accelerometry between age 3 and 5 years. Current asthma is defined as physician -diagnosed asthma, ISAAC -based current asthma definition or MeDALL -based current asthma definition.

aORadjusted ORBMIbody mass indexISAACInternational Study of Asthma and Allergies in ChildhoodMeDALLMechanisms of the Development of AllergyMVPAmoderate to vigorous PA