The LCSR Measures – Aggregate Report is an interactive tool for viewing your site’s data. It includes comparisons to regional and national peers as well as trends over time.


The report contains many of the statistics available in the LCSR Quarterly Aggregate Report and several new calculations and features:

  • Data for the current performance year are refreshed weekly, rather than quarterly

  • Color-coded rankings provide visual feedback with values determined by how well your site’s measure compares to a peer group’s quartiles – e.g. in the Top 25% of all sites in the group, Bottom 25% of all sites, etc.

  • Site rankings compared to the entire LCSR are available across years, to identify measures that have improved or declined over time

  • Interactive functions, such as clicking on a table or hovering over a number or graphic, help you find useful information, such as detailed trends and statistics.

NOTE: as of April 2020 the Facility Comparisons tab allows you to select multiple facilities and compare their rankings, as well as compile total measures and rankings. See the Facility Comparisons section, below, for details.

The report is divided into tabs across the top of the screen. Hover your pointer over the Info icon (blue circle) in the upper left corner to see general information about that report tab.

Several short videos are available to demonstrate how to navigate and use the report:

If you'd like a more general introduction to working with NRDR interactive reports, check out these demo videos.


Facilities Map

The Facilities Map provides a visual representation of which facilities are included in the report's Census Division comparison statistics for a selected year. Each division is color coded. Click on the division legend to highlight the associated sites on the map.LCSR Division Map

Peer Comparisons

The Peer Comparisons tab compares a single site’s data to various peer groups, including sites 

  • in the same Census Division (e.g. East North Central, Mountain)

  • of the same facility type (e.g. Academic, Freestanding center)

  • in the same type of location (e.g. Suburban, Metropolitan), and

  • in the entire registry

The data table shows each measure, the measure rate, and the numerator and denominator values for the rate.

Note: The LCSR Measure Definitions tab contains a brief description of each measure. More detailed information on each measure is also available here.


Each peer group is comprised of sites that have the same characteristic, e.g. sites in the same Census Division, of the same facility type, etc. Each site must meet a minimum number of cases for the measurement year to be included in peer group statistics. Hovering over the number of cases in a peer group shows how many sites met the threshold.

LCSR Facility Comparison Rankings

(click on the image for a better view)


Each circle is color coded to represent the site's ranking compared to the peer group, in terms of quartiles. For example, the Top 25% group indicates the facility performed well and was better than 75% of all sites in that group, and Bottom 25% indicates the facility rate was relatively poor, faring worse than 75% of all sites in the group.

Additional details are available for each measure comparison by hovering over the circle. In the example, below, hovering the mouse over the circle for Mean Dose Length Product – overweight (BMI of 25.0 to 29.9) shows a detailed bar chart with the facility rate (light blue dot) and each of the quartiles (differently colored shaded areas) for all sites in the same Census Division. 

LCSR Peer Comparison Hover Detail

(click on the image for a better view)

In this example, each shaded area represents the range of rates for one-quarter of the facilities in the North Central Census Division in 2019 that met the case threshold:

  • The topmost (tan) shaded portion is for sites with a rate of 107.9 or higher

  • The next shaded region is for sites that had a rate between 88.42 and 107.9

  • The next tan shaded area is for sites with a rate between 71.6 and 88.42, and

  • The lowermost gray region is for sites with rates less than 71.6

Because this is an inverse measure (higher radiation doses are generally less desirable), the site’s average Dose Length Product rate of 83.54 per exam ranks in the Top 50% to 25%.

Note: some measures, such as CTDIvol and DLP, are inverse, so lower rates are better and the 25th percentile (Bottom 25% ranking) is the uppermost shaded area, as in the example, above. For other rates, such as Smoking Cessation Counselling, higher rates are better, so the Bottom 25% area appears in the gray shaded area at the bottom of the graph.



Annual Trends

The Annual Trends tab provides rankings over time for the selected site compared to all LCSR sites meeting the case threshold. Clicking on a measurement name in the table creates detailed graphs for that measure. The line chart compares the facility’s rate (green line) to the registry median (gray line), for each available year. Therefore, for measures where higher rates are better, when the facility rate is below the registry median line the facility ranking will be in either the Bottom 25% or Bottom 50% to 25%. For inverse measures, such as Dose Length Product (DLP), the opposite is true – a facility rate above the registry median line means the facility performed worse than half of all sites in the LCSR.

Note: For some measures, such as Cancer Detection Rate (CDR), the facility rate and registry median trends may be the same, in which case only one line may be visible. Click on a series in the Measure Trend legend to highlight either the Facility Rate or Registry (Median) series in the line chart.

LCSR Annual Trends

Note: The registry median (gray line), also known as the 50th percentile, represents the midpoint across all facilities; that is, half of the facilities in the LCSR have a rate below this value, and half have a rate above this value.


Hover over a colored ranking circle or over the registry data point (indicated by a dot with a numbered value) in the line chart to see details for that year, including the registry 25th, median (50th), 75th, and 95th percentiles.


The bar chart shows the number of cases for the facility for the selected measure by year, to provide some context to the facility rate and ranking.

Facility Comparisons

The Facility Comparisons tab provides rankings for multiple facilities so you can compare data across facilities. The report also includes total measurement rates, compiled across the selected facilities.

LCSR Facility Comparisons Tab

(click on the image for a better view)

Hovering over a ranking circle provides additional information about the registry percentiles that determined the ranking for that facility and measure.



Facility Characteristics

The Facility Characteristics tab displays the number of sites by Facility Type, Location Type, and Census Division. Each stacked bar chart denotes the number of sites that met the case threshold for the year (blue bars), and the number of sites that fell below the threshold (gray bars). 

LCSR Facility Characteristics

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