Table 4

Overall associations between maternal physical activity (in MET*hours/week) and infant’s birth weight (g)

Per MET*hours/week	Crude model			Adjusted model A*			Adjusted model B^†
Per MET*hours/week	Estimate	95% CI	p Value	Estimate	95% CI	p Value	Estimate	95% CI	p Value
Total energy expenditure
First trimester	0.23	−0.02 to 0.49	0.076	−0.23	−0.54 to 0.09	0.154	−0.18	−0.49 to 0.13	0.263
Second trimester	0.46	0.10 to 0.83	0.014	−0.01	−0.43 to 0.41	0.947	−0.02	−0.43 to 0.38	0.904
Third trimester	0.49	0.10 to 0.88	0.015	−0.01	−0.52 to 0.51	0.972	−0.06	−0.58 to 0.45	0.812
Sports and exercise
First trimester	−1.19	−3.18 to 0.80	0.243	−2.54	−4.78 to 0.30	0.027	−2.20	−4.42 to 0.01	0.051
Second trimester	−0.83	−2.93 to 1.27	0.437	−0.56	−2.90 to 1.78	0.639	−0.27	−2.54 to 1.99	0.814
Third trimester	−0.91	−3.42 to 1.59	0.475	0.41	−2.41 to 3.23	0.776	0.34	−2.44 to 3.12	0.811
Vigorous exercise
First trimester	−0.69	−4.16 to 2.78	0.695	−2.64	-6.17 to 0.89	0.142	-2.07	-5.53 to 1.38	0.239
Second trimester	0.08	−4.25 to 4.41	0.972	0.07	−4.26 to 4.40	0.973	0.69	−3.59 to 4.96	0.753
Third trimester	0.29	−6.36 to 6.95	0.931	−1.87	−8.18 to 4.44	0.562	-1.12	−7.31 to 5.07	0.723

*Adjusted for gestational age at delivery, infant’s sex, study centre, maternal prepregnancy BMI, age, education, ethnicity, parity, drug use, smoking, paternal weight, history of diabetes, third trimester sleep score, physical activity prior to pregnancy and in a previous trimester, where applicable.
†Adjusted for variables of model A plus gestational weight gain.
MET, metabolic equivalent of task.