Table 2

Determinants of fitness at age 17 years in cohort A (data at 13 and 17 years, n=351)

		Model 1		Model 2
		β^* (95% CI)	p	B (95% CI)	p
Preschool BMI (2–7 y), kg/m²		−1.25 (−1.92 to −0.57)	0.0003
LTPA change			<0.0001		<0.0001
	LTPA increase vs LTPA decrease	1.15 (−1.59 to 3.89)^†	0.70^‡	1.20 (−1.18 to 3.58)^†	0.56^‡
	LTPA increase vs persistently sedentary	1.18 (−1.43 to 3.79)^†	0.65^‡	0.97 (−1.31 to 3.24)^†	0.69^‡
	LTPA increase vs persistently active	−5.16 (−7.37 to −2.94)^†	<0.0001^‡	−5.05 (−6.98 to −3.11)^†	<0.0001^‡
	LTPA decrease vs persistently sedentary	0.03 (−2.53 to 2.59)^†	1.00^‡	−0.23 (−2.47 to 2.00)^†	0.99^‡
	LTPA decrease vs persistently active	−6.30 (−8.43 to −4.18)^†	<0.0001^‡	−6.25 (−8.09 to −4.40)^†	<0.0001^‡
	Persistently sedentary vs persistently active	−6.34 (−8.36 to −4.31)^†	<0.0001^‡	−6.01 (−7.78 to −4.25)^†	<0.0001^‡
Gender (girls compared with boys)		−7.29 (−6.14 to −8.44)	<0.0001	−6.86 (−7.87 to −5.85)	<0.0001
BMI at age 17, kg/m²				−0.91 (−1.06 to −0.74)	<0.0001

Model 1, preschool mean BMI (z-score) included.
Model 2, BMI at age 17 year included instead of preschool BMI.
↵* Regression coefficient for a change in fitness when the explanatory variable increases one unit.
↵† Mean (95% CI) differences of least square means, that is, estimated mean difference between groups.
↵‡ Tukey-Kramer adjusted p values.
BMI, body mass index; LTPA, leisure-time physical activity.