Epidemiology · 2006 · 19 citations · 7 references
Physical activity may affect peak magnetic field exposure. If the early nausea and later cumbersomeness of healthy pregnancies leads to reduced physical activity, this could distort measured magnetic field-health outcome associations.
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Longitudinal Data Analysis for Discrete and Continuous Outcomes
Scott L. Zeger, Kung‐Yee Liang · Biometrics · 1986 · 7.8K citations
Maternal Exercise during Pregnancy, Physical Fitness, and Fetal Growth
Maureen Hatch, Xiao-Ou Shu, Diane E. McLean et al. · American Journal of Epidemiology · 1993 · 200 citations
Activity Patterns During Pregnancy
Michelle F. Mottola, M. Karen Campbell · Canadian Journal of Applied Physiology · 2003 · 131 citations