Table 3.
Concordance between self-reported and registered-based health care utilization (using the latter as reference), Belgian Health Interview Survey 2008 (population aged 15 years and over)
| Accurate reporting | Overreporting a | Underreporting b | Agreement | PPV c | NPV d | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % | (95 % CI) | % | (95 % CI) | % | (95 % CI) | kappa | (95 % CI) | % | (95 % CI) | % | (95 % CI) | |
| Contact GP < 12 m | 84.8 | (83.7–85.9) | 5.9 | (5.3–6.7) | 9.2 | (8.4–10.2) | 0.47 | (0.45–0.50) | 91.5 | (90.8–92.2) | 53.6 | (51.1–56.1) |
| Contact specialist < 12 m | 75.6 | (74.3–76.9) | 4.9 | (4.3–5.5) | 19.5 | (18.3–20.8) | 0.49 | (0.47–0.51) | 89.2 | (88.2–90.1) | 58.7 | (57.2–60.3) |
| Contact dentist < 12 m | 80.3 | (79.0–81.5) | 14.6 | (13.5–15.8) | 5.1 | (4.5–5.8) | 0.59 | (0.57–0.60) | 71.6 | (70.2–72.9) | 87.7 | (86.7–88.7) |
| Contact dentist < 6 m | 85.2 | (84.0–86.3) | 7.7 | (6.9–8.6) | 7.1 | (6.3–8.0) | 0.65 | (0.63–0.67) | 74.3 | (72.5–76.0) | 90.2 | (89.4–91.0) |
| Contact physiotherapist < 12 m | 88.3 | (87.3–89.3) | 5.6 | (5.0–6.3) | 6 | (5.3–6.9) | 0.60 | (0.58–0.62) | 67.9 | (65.5–70.2) | 92.2 | (91.5–92.8) |
| Inpatient hospitalisation < 12 m | 95.2 | (94.5–95.7) | 2.9 | (2.5–3.4) | 1.9 | (1.6–2.3) | 0.75 | (0.72–0.77) | 75.7 | (73.1–78.1) | 97.2 | (96.8–97.5) |
| Day patient hospitalisation < 12 m | 89.7 | (88.8–90.5) | 2.1 | (1.7–2.5) | 8.2 | (7.5–9.1) | 0.43 | (0.40–0.46) | 69.7 | (66.1–73.2) | 90.5 | (89.8–91.1) |
< 12 m: in the 12 months prior to the date of the interview
< 6 m: in the 6 months prior to the date of the interview
a Overreporting: self-reported contact, but no register-based contact
b Underreporting: no self-reported contact, but register-based contact
c PPV: positive predictive value
d NPV: negative predictive value