Dunham 1987.

Methods	Controlled before and after study, 3 and 6 months follow up
Participants	Corporate office of a Midwestern utility organisation, non‐supervisory (professional, clerical and technical) and supervisory personnel
Interventions	Flextime/flexitime
Outcomes	Physical health: physiological stress (7‐item, Patchen 1970) Mental health: psychological stress (7‐item, Patchen 1970)
Type of flexibility	Worker negotiated
Notes	—
Risk of bias
Bias	Authors' judgement	Support for judgement
Appropriate control	Low risk
Adequate follow‐up response	Low risk
Adjustment for non‐response	Low risk
Conclusions substantiated	Low risk
Adequate adjustment for confounders	High risk
Protection against contamination	Low risk
Appropriate statistics	High risk