Biased sampling designs to improve research efficiency: Factors influencing pulmonary function over time in children with asthma

Jonathan S. Schildcrout, Paul J. Rathouz, Leila R. Zelnick +2

Substudies of the Childhood Asthma Management Program [Control. Clin. Trials 20 (1999) 91-120; N. Engl. J. Med. 343 (2000) 1054-1063] seek to identify patient characteristics assoc…