We identified 63 789 women who were between the ages of 30 and 64 years, had not had a hysterectomy, had a primary care clinician at Kaiser Permanente Washington (KPWA), and had been continuously enrolled in the health system for at least 3 years and 5 months. Of these women, 17 256 (27.1%) had not had a Papanicolaou test within 3 years and 5 months. Postrandomization exclusions were applied owing to delays in data warehouse update. The total included in the intervention group analysis (9960) equals the total included in the round 1 analysis group (8120) plus the total included in the round 2 analysis group (1631) plus the total included in the round 3 analysis group (209). Similarly, the total included in the control group analysis (9891) equals the total included in the round 1 analysis group (8111) plus the total included in the round 2 analysis group (1585) plus the total included in the round 3 analysis group (195).