2.6 Comparison with the short version of the original full-length American TOFHLA
COPD
REGRESSION, COPD
The development of the S-TOFHLA was based on subjective decisions combined with some linear regression modelling, the latter being subjectively adapted to facilitate easy scoring [For comparison, a subset of the items in the D-TOFHLA was selected in accordance with the subset used in the S-TOFHLA (the first 36 reading comprehension items and numeracy items 1,4,5, and 8) and, using the same weighting as in the S-TOFHLA (2 and 7 respectively), a Danish mirror version of the S-TOFHLA was constructed. Thus, the ‘D-36-4-TOFHLA’ was based on 40 items from the D-TOFHLA combined in the following MLR equation (reading comprehension, R, and numeracy, N):
Pearson’s correlation coefficient between the D-36-4-TOFHLA score and the D-TOFHLA score, for the 158 COPD patients recruited from the TeleCare North cohort, was calculated.Most studies using the S-TOFHLA, have chosen to omit the numeracy items [Using the same 158 COPD patients, Pearson’s correlation coefficient between the D-36-0-TOFHLA score and the D-TOFHLA score was calculated.