Stalling COVID-19 vaccination rates threaten public health. To increase vaccination rates, governments across the globe are considering using monetary incentives. We present evidence on the effect of guaranteed payments on COVID-19 vaccination uptake. We ran a large pre-registered randomized controlled trial (N = 8,286) in Sweden and linked the data to population-wide administrative vaccination records. We found that modest monetary payments of $24 (SEK 200) increased vaccination rates by 4.2 percentage points (p = 0.005), from a baseline rate of 71.6%. In contrast, behavioral nudges increased stated intentions to vaccinate but had only small and not statistically significant impacts on vaccination rates. The results highlight the potential of modest monetary incentives to increase vaccination rates.

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Coffee consumption after colectomy was safe and was associated with a reduced time to first bowel action.

Estimates of the prevalence of multimorbidity in medical inpatients based on administrative data, chart reviews and medical records were very high and congruent for the different definitions of multimorbidity. Agreement for rating multimorbidity based on the different data sources was moderate to good. Administrative hospital discharge data are a valid source for exploring the burden of multimorbidity in hospital settings.