Cancer screening aggressiveness scores of primary care physicians in different guideline perception groups (2006–2007 National Primary Care Physician Cancer Screening Survey). Model-adjusted means, representing predicted marginals from general linear model of cancer screening aggressiveness, controlling for physician and practice characteristics. A 10-point difference in aggressiveness score represents 1 standard deviation. Total N = 1212 for breast cancer screening group, 1115 for cervical cancer screening group. Multiple-conservative group included any of the following guideline combinations: USPSTF + ACP, USPSTF + AAFP, ACP + AAFP, USPSTF + ACP + AAFP. Multiple-conflicting group included any of the following guideline combinations: USPSTF + ACS, USPSTF + ACOG, ACP + ACS, ACP + ACOG, AAFP + ACS, AAFP + ACOG, ≥3 guidelines (not including USPSTF + ACP + AAFP). Multiple-aggressive group consisted of ACS + ACOG. CI indicates confidence interval; USPSTF, US Preventive Service Task Force; ACP, American College of Physicians; AAFP, American Academy of Family Physicians; ACS, American Cancer Society; ACOG, American College of Obstetrics and Gynecology.