• Frailty and multimorbidity uncommon in the general population
• Frail elderly regularly also present multimorbidity
• Causal association possibly works bidirectional

The majority of frail elderly are also multimorbid, but only a minority of multimorbid elderly tend to be frail. This conclusion has been drawn by an international research team which analysed the data of 48 studies involving 78,122 participants, of which 25 were included in the meta analyses.