![COVID-19 Stats: Percentage of Middle and High School Students Aged 13–21 Years Attending In-Person Classes Who Reported Observing Fellow Students Wearing a Mask All the Time, by School Setting and Activity — COVID-19 Stats: Percentage of Middle and High School Students Aged 13–21 Years Attending In-Person Classes Who Reported Observing Fellow Students Wearing a Mask All the Time, by School Setting and Activity —](https://www.cdc.gov/mmwr/volumes/70/wr/figures/mm7006a5-F.gif)
COVID-19 Stats: Percentage of Middle and High School Students Aged 13–21 Years Attending In-Person Classes Who Reported Observing Fellow Students Wearing a Mask All the Time, by School Setting and Activity —
![Estimating the standardized incidence ratio (SIR) with incomplete follow-up data | BMC Medical Research Methodology | Full Text Estimating the standardized incidence ratio (SIR) with incomplete follow-up data | BMC Medical Research Methodology | Full Text](https://media.springernature.com/lw685/springer-static/image/art%3A10.1186%2Fs12874-017-0335-3/MediaObjects/12874_2017_335_Fig1_HTML.gif)
Estimating the standardized incidence ratio (SIR) with incomplete follow-up data | BMC Medical Research Methodology | Full Text
![Characterising the background incidence rates of adverse events of special interest for covid-19 vaccines in eight countries: multinational network cohort study | The BMJ Characterising the background incidence rates of adverse events of special interest for covid-19 vaccines in eight countries: multinational network cohort study | The BMJ](https://www.bmj.com/content/bmj/373/bmj.n1435/F1.large.jpg)
Characterising the background incidence rates of adverse events of special interest for covid-19 vaccines in eight countries: multinational network cohort study | The BMJ
![Measures of disease frequency (II). Calculation of incidence Strategy #2 ANALYSIS BASED ON PERSON-TIME CALCULATION OF PERSON-TIME AND INCIDENCE RATES. - ppt download Measures of disease frequency (II). Calculation of incidence Strategy #2 ANALYSIS BASED ON PERSON-TIME CALCULATION OF PERSON-TIME AND INCIDENCE RATES. - ppt download](https://images.slideplayer.com/4/1425655/slides/slide_4.jpg)