Table 2. Unadjusted and adjusted relative risk of LDCT rate for beneficiaries aged 55–77 in 2017.
| Variables | Percent screened (1/1,000) | Unadjusted relative risk | Adjusted relative risk |
|---|---|---|---|
| All | 6.1 (5.9–6.2) | ||
| Age | |||
| 55–59 | 4.0 (3.8–4.2) | Reference | Reference |
| 60–64 | 6.2 (5.9–6.4) | 1.55 (1.46–1.63) | 1.32 (1.25–1.40) |
| 65–69 | 7.6 (7.4–7.8) | 1.90 (1.81–2.00) | 1.53 (1.45–1.61) |
| 70–74 | 6.7 (6.5–6.9) | 1.69 (1.61–1.78) | 1.27 (1.20–1.33) |
| 75–77 | 4.5 (4.3–4.7) | 1.14 (1.07–1.21) | 0.79 (0.74–0.85) |
| Gender | |||
| Female | 5.5 (5.3–5.6) | 0.81 (0.78–0.84) | 0.85 (0.81–0.87) |
| Male | 6.8 (6.6–6.9) | Reference | Reference |
| Insurance | |||
| HMO | 5.2 (5.0–5.3) | 0.81 (0.78–0.84) | 1.01 (0.97–1.06) |
| Fee for service | 6.4 (6.2–6.5) | Reference | Reference |
| Region | |||
| New England | 13.1 (12.5–13.7) | Reference | Reference |
| Middle Atlantic | 7.0 (6.7–7.3) | 0.52 (0.48–0.56) | 0.55 (0.51–0.60) |
| South Atlantic | 6.9 (6.7–7.1) | 0.54 (0.50–0.58) | 0.50 (0.47–0.54) |
| East North Central | 6.9 (6.7–7.2) | 0.54 (0.50–0.58) | 0.54 (0.50–0.57) |
| West North Central | 8.6 (8.2–8.9) | 0.68 (0.63–0.73) | 0.66 (0.61–0.71) |
| East South Central | 8.3 (7.8–8.7) | 0.74 (0.68–0.81) | 0.68 (0.62–0.74) |
| West South Central | 2.4 (2.2–2.6) | 0.19 (0.17–0.20) | 0.20 (0.18–0.21) |
| Mountain | 3.3 (3.1–3.6) | 0.27 (0.25–0.30) | 0.30 (0.27–0.33) |
| Pacific | 4.3 (4.1–4.5) | 0.34 (0.31–0.37) | 0.45 (0.41–0.49) |
| Comorbidity (excluding COPD) | |||
| 0 | 3.4 (3.2–3.5) | Reference | Reference |
| 1 | 6.7 (6.4–6.9) | 1.97 (1.89–2.06) | 1.06 (1.01–1.12) |
| 2 | 7.6 (7.3–7.9) | 2.25 (2.15–2.35) | 0.97 (0.92–1.02) |
| 3 | 8.4 (8.0–8.8) | 2.49 (2.36–2.62) | 0.85 (0.80–0.90) |
| 4+ | 8.7 (8.4–9.0) | 2.58 (2.47–2.70) | 0.47 (0.44–0.49) |
| Prior COPD/emphysema diagnosis | |||
| No | 3.3 (3.2–3.4) | 0.10 (0.10–0.11) | 0.17 (0.16–0.18) |
| Yes | 31.7 (31.0–32.4) | Reference | Reference |
| Prior tobacco diagnosis | |||
| No | 3.1 (2.9–3.2) | 0.12 (0.11–0.12) | 0.20 (0.19–0.21) |
| Yes | 26.2 (25.7–26.7) | Reference | Reference |
| Outpatient visits in prior year | |||
| ≤1 | 2.2 (2.1–2.3) | Reference | Reference |
| >1 and ≤4 | 5.5 (5.3–5.7) | 2.48 (2.34–2.62) | 1.71 (1.61–1.81) |
| >4 and ≤8 | 7.3 (7.0–7.5) | 3.29 (3.11–3.47) | 1.74 (1.63–1.84) |
| >8 | 9.2 (8.9–9.5) | 4.18 (3.97–4.41) | 1.54 (1.44–1.64) |
LDCT, low-dose computed tomography; HMO, health maintenance organization; COPD, chronic obstructive pulmonary disease.