Table 3. Prevalence of Multimorbidity by Age and Definition Among All 667,379 Active Patients and 148 Practices as of October 1, 2011 | Age (Years) | ≥2 Chronic Conditions | ≥3 Chronic Conditions | Chronic Conditions, Median (IQR) |
|---|
| Patients in All Practices* | Prevalence Among Practices† | Patients in All Practices* | Prevalence Among Practices† |
|---|
| 18–34 | 13.85 (22,025) | 14.21 (6.58, 28.98) | 4.97 (7911) | 4.93 (1.86, 13.60) | 0 (0–1) |
| 35–44 | 29.83 (31,683) | 32.50 (16.47, 55.43) | 15.10 (16,032) | 15.73 (6.58, 34.54) | 1 (0–2) |
| 45–54 | 44.82 (58,022) | 47.48 (26.69, 69.97) | 26.88 (34,794) | 27.90 (11.76, 50.78) | 1 (0–3) |
| 55–64 | 61.00 (76,684) | 66.01 (41.19, 81.93) | 71.92 (52,594) | 44.62 (24.20, 65.33) | 2 (1–4) |
| 65–74 | 74.30 (59,902) | 78.74 (54.12, 91.57) | 57.35 (46,231) | 60.63 (35.55, 79.34) | 3 (1–4) |
| 75–84 | 80.99 (37,668) | 87.26 (60.32, 96.50) | 67.51 (31,402) | 73.79 (42.80, 88.39) | 4 (2–5) |
| ≥85 | 80.82 (16,024) | 87.30 (61.55, 98.34) | 68.99 (13,677) | 75.66 (44.09, 92.69) | 4 (2–6) |