Change log

Lookup tables

  • July 2, 2012: An error came to light in the equation for approximating splines in age for M and L for FEV1 in females. Similarly a typo was found in the coefficient for p2 for FEV1/FVC for African American females. People are advised to download the updated lookup file. Apologies for the inconvenience.
  • August 30, 2012: Error in c4 for FEV1 in males: old value -220.3631, corrected value -109.6777.
  • November 15, 2012: Minor inconsistencies redressed.
  • January 31, 2013: An error was spotted (lookup table) in the equation for deriving Lspline for FEV1/FVC in males.
  • March 5, 2013: Calculating Mspline and Sspline for FEF25-75% in males led to in accurate results (corrected). In the process slight changes occurred in the lookup table for Mspline and Sspline.
  • April 7, 2013: Cosmetic changes, no coefficients have been changed.
  • May 3, 2013: Implementation document updated, the text referred to an obsolete lookup table.
  • January 22, 2013: Error in last column of table E2 corrected: coefficients should be 0.
  • April 7, 2013: Constants in table E4 now consistent with lookup tables.

2

GLI-2012 Desktop Software for Individual Calculations

  • August 20, 2012: Whereas the pictogram displayed correct values, an error occurred in the numeric output of FEV1/FVC.
  • October 9, 2012: When selecting FEF25-75% via Preferences, no output was generated. Corrected 9 Oct. 2012.
  • November 15, 2012: Added the facility to specifcy VC as IVC, SVC or FVC.
  • December 10, 2012: Fixed a small issue with printed output.
  • March 26, 2013: Fixed an issue with FEF25-75% in males.
  • December 18, 2013: Fixed an issue with an inconsequential error message.

GLI-2012 Desktop Software for Large Data Sets

  • Calculation of SD could go wrong in previous version.
  • Added facility for deriving FEF75% constants for new group.
  • March 26, 2013: A bug in the polynomial equations and lookup table for FEF25-75% in males.

R Macro

  • March 2014: R macro was updated to include percent predicted for all of the outcomes.

SAS Macro

  • April 2013: SAS macro was updated to be consistent with the updated look-up tables.

Click here for information about applicability of GLI-2012 equations (indices, age range, ethnicity, countries covered) or here for validation studies of the GLI-2012 equations and impact if implementation on clinical interpretation of measurements.