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Comparison of the percent of women with a mammogram in the last 24 months at baseline and at the end of the last valid study period by age and arm. For age 40–49, baseline is end of Year 1, last valid period is Year 4. For age 50–74, baseline is Year 0, last valid period is Year 4. For age 75–84, baseline is Year 0, last valid period is Year 3. LO letter only arm; RC reminder call arm; CC counseling call arm.
