How strong is the evidence for Psychological Wellbeing?

Two independent meta-analyses link dispositional optimism to lower cardiovascular events and all-cause mortality, and a broader synthesis found psychological well-being predicts all-cause mortality independently of the absence of distress — suggesting wellbeing is not just the inverse of mental illness. That evidence is currently rated strong (72/100), built on 9 published studies, including 5 meta-analyses -- enough for real confidence in the effect.