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    Item #
    Length
    Source of Standard
    Year Implemented
    Version Implemented
    Year Retired
    Version Retired
  
  
    1784
    4
    NAACCR
    2015
    15
    
    
  



NAACCR XML: Tumor.survMosActiveFollowup




Description
The survival interval in months is calculated using the month, day, and year of the Surv-Date DX Recode [1788] and the month, day, and year of the Surv-Date Active Followup [1782]. The survival interval is calculated by a program available from your standard setter or NAACCR.  

Example of a case diagnosed in 2011 and submitted in 2013.  
Date of submission: 20131101 
Date of diagnosis: 20110915
Date of last contact: 20111017 
Vital status: Alive 
Study cutoff date: 20111231 
20111017 would be used as the date of last contact for the survival calculation. The survival time would be 1 month.
Rationale
Accurate survival estimates are crucial for monitoring trends in population-based cancer survival and assessing the effectiveness of healthcare delivery to cancer patients. With the aim of obtaining the most precise estimates of survival, it is necessary to use complete dates (month, day, and year components) in the calculation of the survival interval. The survival interval in months is calculated using complete dates, and the algorithm imputes missing components of dates when they are not available in central registry records.
Additional information about the algorithm and what specific values are assigned in given missing date situations are available here: 













http://seer.cancer.gov/survivaltime/.
Codes
A value of 9999 is for missing and matches the Surv- Flag Active Followup value of 9 or blank. Leading zeros will be used when needed to left fill the field.  
Calculation 
Survival months = FLOOR((endpoint – date of diagnosis) / days in a month) 

The FLOOR function rounds a decimal down to an integer, e.g., FLOOR(1.68) = 1.  Days in a month is assigned as 365.24/12.