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Table 3 Weighted absolute mean difference between dates on the case report and the medical record

From: Assessing the validity of tuberculosis surveillance data in California

Dates Weighted Absolute Mean Difference (days) Coefficient of Variation (C.V.) %
Month/day/year dates   
Birth date 48.4 39.9
Treatment start 2.6 17.0
Isolate collection for drug susceptibility testing 13.0 26.1
First positive culture 6.1 31.0
First consistently negative culture 25.0 15.1
Treatment stop 19.2 11.3
Isolate collection for final susceptibility testing 110.9* 44.5
Dates Weighted Absolute Mean Difference (months) Coefficient of Variation (C.V.) %
Month/year dates   
Case reported to local health department 0.74 10.0
Entry into U.S. 11.5 20.2
  1. Note: All results are presented as survey-weighted mean estimates for the statewide cohort from which the sample was drawn.
  2. * Based on small number of cases with final susceptibility testing performed; therefore estimate is subject to considerable instability