5. Trials without usable data for outcomes in Summary of Findings tables in Comparison 1.

Outcomes included in Summary of Findings tables	Included studies that are believed to have measured the outcome, but did not report it in a usable format
Change in DBP (mmHg)	Arzilli 1986: only between‐group P values reported CSSS Collaborative Group 2007: reported in a figure Kawasaki 1998: reported mean change in intervention group, but not control group Mu 2009: reported only mean change with no SDs or participant numbers
Change in SBP (mmHg)	Arzilli 1986: only between‐group P values reported Kawasaki 1998: reported mean change in intervention group, but not control group Mu 2009: reported only mean change with no SDs or participant numbers
Hypertension	None
Blood pressure control	None
Cardiovascular events: various	Li 2016: reported non‐significant difference between groups (not exact P value), mean difference not reported Suppa 1988: numbers of events per group not reported
Cardiovascular events: non‐fatal stroke	None
Cardiovascular events: non‐fatal ACS	None
Cardiovascular mortality	None
Stroke mortality	None
Change in blood potassium (mmol/L)	Sarkkinen 2011: reported change and significance of change in control group only
Hyperkalaemia	Li 2016: reported non‐significant difference between groups (not exact P value), mean difference not reported
Hypokalaemia	None
Adverse events: other	Suppa 1988: numbers of events per group not reported

Abbreviations: 
ACS: acute coronary syndrome
DBP: diastolic blood pressure
SBP: systolic blood pressure
SD: standard deviation