Table 2.

Kaplan-Meier estimates with 95% confidence intervals of percent with follow-up colonoscopy at 1, 2, 3, 6, and 12 months after a positive fecal blood test in 2011–2012, by PROSPR healthcare system (N=62,384)

Healthcare system	1 month	2 months	3 months	6 months	12 months
Group Health	14.9 (13.5–16.2)	38.9 (36.9–40.8)	51.3 (49.3–53.3)	62.8 (60.7–64.7)	68.2 (66.0–70.1)
Kaiser Permanente Northern California	28.3 (27.8–28.8)	61.5 (61.0–62.0)	73.4 (72.9–73.9)	80.9 (80.5–81.3)	83.8 (83.4–84.3)
Kaiser Permanente Southern California	39.3 (38.7–39.9)	61.9 (61.3–62.5)	69.6 (69.0–70.2)	74.4 (73.8–74.9)	76.4 (75.8–76.9)
Parkland Health and Hospital System – University of Texas Southwestern Medical Center	2.4 (0.8–3.9)	17.0 (13.1–20.8)	34.7 (29.4–39.5)	50.2 (44.3–55.5)	58.1 (51.6–63.7)

PROSPR: Population-Based Research Optimizing Screening through Personalized Regimens