Figure 1.

Associations between nursing home crowding index and incidence of outbreak-associated respiratory infections and deaths

Associations between crowding index and infections (A) and deaths (B). To visualise trends in data for nursing homes, homes were combined into 20 equal-sized groups of 29–30 homes according to crowding index (black points). The red line shows the negative binomial model-based association with the crowding index, the shaded area showing the 95% CI. Each one-point increase in the crowding index was associated with a 1·92-times increase in incidence of infection (95% CI 1·74–2·11) and a 1·96-times increase in respiratory infection-associated mortality (1·68–2·28).