Table 1 Data items extracted for all trials

Primary registry ID

Study title

Countries of recruitment

Date of trial registration

Timing of registration (relative to study start date)

Study start date

Recruitment start date

Expected date of study completion (or end)

Study status

Study phase

Primary study design

Health condition addressed by the trial

Type of intervention studied

Participant age group

Participant gender

Type of participant studied^a

Publication of results

Publication of trial protocol

Study sponsor