Table 2.

Methodological quality of the controlled trials

Study	Selection criteria specified	Study design	Score	Other causing of death report	Dropouts explained	Funding
Meyer C	Yes	RCS	30	No	No	NS
Jakab SS	Yes	RCS	32	Yes	Yes	NS
Neumanna UP	Yes	PCS	31	No	No	NS
Morioka D	Yes	RCS	30	No	No	NS
Langrehr JM	Yes	RCS	33	Yes	Yes	NS
Suehiro T	Yes	RCS	30	Yes	No	NS
Harihara Y	Yes	RCS	30	No	No	NS
Vijayan B	Yes	PCS	35	Yes	Yes	NS
Sugawara Y	Yes	RCS	30	Yes	No	NS
Doran	Yes	RCS	30	No	No	NS
Poli F	Yes	RCS	31	No	No	NS
Yagihashi A	Yes	RCS	30	No	No	NS
Afzal N	Yes	RCS	33	No	No	NS
Markus BH	Yes	RCS	32	No	Yes	NS
Donaldson P	Yes	RCS	32	No	Yes	NS
Knechtle SJ	Yes	RCS	31	No	Yes	NS

RCS: Retrospective cohort studies; NS: Not specified.