Study	Reason for exclusion
Atkinson 1988	Not a randomized study
Braden 1997	Not a randomized study
Campfield 1997	Not a randomized study
Giacoia 1991	Not a randomized study
Horgan 1996	Not a randomized study
Kao 1987	Complex design using randomization into two groups with pre‐determined (not random) sequence of event. Comparison between simultaneous events in the two groups would allow to compare theophylline with placebo (or theophylline and diuretic vs diuretic alone) rather than diuretic with placebo.
Kao 1988	Complex design using randomization into two groups with pre‐determined (not random) sequence of event. Comparison between simultaneous events in the two groups would allow to compare theophylline with placebo (or theophylline and diuretic vs diuretic alone) rather than diuretic with placebo.
Kazzi 1992	Not a randomized study. Patients included in the study were infants with BPD who were started on diuretic therapy upon decision by the clinician. Controls were infants without BPD who did not receive diuretic therapy.
Perlman 1986	Not a randomized study
Segar 1992	This study does not provide any information on the outcome variables selected for this systematic review.
Sonntag 1996	Not a randomized study
Verma 1994	Not a randomized study