Table 1.
Survey-Weighted Baseline Patient Demographic Characteristics From Sampled Ambulatory Visits for Chronic, Symptomatic FBDs in the NAMCS, 2007–2015
| Characteristics | All Chronic Functional Bowel Disorders (95% CI) | IBS or Chronic Abdominal Pain (95% CI) | Chronic Constipation (95% CI) | Chronic Diarrhea (95% CI) |
|---|---|---|---|---|
| Weighted sample visits, N | 36,938,000 (31,452,000–42,424,000) | 24,381,000 (20,304,000–28,458,000) | 8,930,000 (6,809,000–10,948,000) | 6,197,000 (4,824,000–7,570,000) |
| Average annual weighted visits, N | 4,104,000 (3,495,000–4,714,000) | 2,730,000 (2,273,000–3,187,000) | 992,000 (768,000–1,216,000) | 689,000 (536,000–841,000) |
| Age, y, % | ||||
| 18–39 | 18.3 (15.6–21.4) | 21.0 (17.3–25.3) | 17.9 (12.7–24.6) | 17.7 (11.6–25.9) |
| 40–59 | 35.5 (31.1–40.1) | 37.2 (31.7–43.1) | 26.6 (19.8–34.8) | 39.7 (30.4–49.8) |
| 60–79 | 35.6 (30.8–40.7) | 34.7 (28.4–41.5) | 40.4 (32.4–49.0) | 28.7 (21.4–37.3) |
| ≥80 | 10.6 (8.0–14.0) | 7.2 (4.6–11.0) | 15.1 (10.0–22.1) | a |
| Female sex, % | 66.8 (62.1–71.1) | 66.9 (60.6–72.7) | 70.0 (61.6–77.2) | 64.5 (54.7–73.2) |
| Race, % | ||||
| White | 84.4 (79.2–88.4) | 83.2 (76.3–88.4) | 85.5 (78.7–90.4) | 90.7 (83.0–95.1) |
| Black | 9.8 (7.3–13.1) | 9.6 (6.7–13.4) | 11.0 (6.8–17.2) | a |
| Other | 5.7 (3.0–10.2) | a | a | a |
| Current tobacco use, % | 15.0 (12.0–18.7) | 14.5 (10.8–19.2) | 12.8 (7.7–20.4) | 22.2 (14.3–32.8) |
| Primary payment method, % | ||||
| Private insurance | 52.0 (46.4–57.4) | 57.4 (51.1–63.4) | 44.5 (36.1–53.3) | 47.7 (37.8–57.7) |
| Medicare/Medicaid | 44.7 (39.5–49.9) | 39.7 (34.0–45.8) | 53.6 (44.9–62.1) | 44.3 (35.4–53.6) |
| Other | 3.3 (2.2–4.8) | 2.9 (1.9–4.5) | a | a |
| US region, % | ||||
| Northeast | 18.3 (13.7–24) | 20.1 (14.7–26.8) | 14.0 (8.7–21.8) | 14.8 (8.5–24.7) |
| Midwest | 19.0 (14.5–24.5) | 17.4 (12.6–23.6) | 22.8 (15.4–32.4) | 19.5 (12.5–29.2) |
| South | 40.1 (32.7–47.9) | 39.3 (31.3–47.9) | 47.5 (36.4–58.9) | 38.6 (28.8–49.3) |
| West | 22.5 (16.9–29.2) | 23.2 (16.5–31.6) | 15.7 (9.5–24.8) | 27.1 (17.7–39.1) |
| Physician specialty, % | ||||
| Primary care | 47.0 (39.8–54.4) | 47.9 (39.5–56.4) | 44.2 (33.8–55.0) | 41.6 (31.3–52.7) |
| Medical care | 45.4 (37.5–53.5) | 44.3 (35.5–53.4) | 49.3 (37.9–60.8) | 52.2 (41.2–63.0) |
| Health care visits in past year, % | ||||
| 0 | 27.2 (22.2–32.8) | 27.1 (21.8–33.2) | 26.9 (18.7–37.0) | 27.7 (20.1–36.9) |
| 1–2 | 33.3 (28.1 – 39.0) | 36.7 (30.1–43.8) | 31.9 (25.2–39.5) | 23.7 (16.7–32.5) |
| 3–6 | 26.1 (22.2–30.4) | 23.4 (19.2–28.2) | 29.1 (21.8–37.6) | 33.1 (24.6–43.0) |
| ≥7 | 13.3 (10.1–17.4) | 12.8 (8.8–18.1) | 12.2 (8.0–18.1) | 15.1 (8.5–26.4) |
| Comorbidity burden, % | ||||
| 0 comorbidities | 35.4 (30.8–40.1) | 35.9 (30.4–41.7) | 36.4 (28.5–45.2) | 35.8 (27.4–45.3) |
| 1 comorbidity | 23.8 (19.5–28.7) | 25.8 (20.1–32.5) | 22.7 (16.3–30.5) | 20.7 (14.7–28.3) |
| ≥2 comorbidities | 40.7 (35.8–45.8) | 38.3 (32.3–44.8) | 40.9 (32.5–50.0) | 43.5 (33.5 – 54.0) |
| Selected comorbidities, % | ||||
| Depression | 14.2 (11.7–17.1) | 15.5 (12.2–19.5) | 12.2 (7.8–18.6) | 15.8 (9.5–25.0) |
| Obesity | 9.4 (7.2–12.1) | 9.0 (6.6–12.1) | 9.9 (5.8–16.3) | 12.4 (7.0 – 21.1) |
| Cancer | 7.5 (4.3–12.8) | a | a | a |
| Diabetes | 16.2 (12.5–20.9) | 13.1 (8.4 – 19.9) | 16.7 (11.1–24.2) | 24.7 (16.7–35.0) |
a
Weighted estimate suppressed because of <30 unweighted observations or relative standard error of >30% (unreliable estimate).