Comparison of the clinical activity from 15 March to 31 May 2019 and from 15 March to 31 May 2020.
Vertical axis, type of analysis; horizontal axis, log[adjusted odds ratio] (0 = no effect, <0 = reduction in activity between 2019 and 2020); solid line, ±2 (standard deviation), the area of each square is proportional to the sample size of analysis 2019 and 2020; P value, P value for linear regression model adjusted to the center; log[OR], logarithm of the odds ratio (OR) for the linear regression model; SD, standard deviation of the log[OR].