Table 3.
Effects of physical activity coaching and severity of FEV1 impairment on health care utilization over the 18-month trial
| Overall Health Care Utilization |
Lung-related Health Care Utilization |
Non–Lung-related Health Care Utilization |
||||
|---|---|---|---|---|---|---|
| Usual Care | Behavioral Intervention | Usual Care | Behavioral Intervention | Usual Care | Behavioral Intervention | |
| No. of patients | 88 | 75 | 51 | 30 | 66 | 57 |
| No. events | 282 | 212 | 129 | 71 | 153 | 141 |
| Person-months of follow-up | 2,514 | 2,148 | 2,514 | 2,148 | 2,514 | 2,148 |
| Prevalence, % (95% CI) | 61 (53–69) | 60 (52–69) | 35 (28–43) | 24 (17–32) | 46 (38–54) | 46 (37–55) |
| Risk ratio (95% CI) | ||||||
| Unadjusted | Ref | 0.99 (0.82–1.20) | Ref | 0.68 (0.47–1.00) | Ref | 1.00 (0.77–1.30) |
| Adjusted I* | Ref | 0.99 (0.79–1.24) | Ref | 0.60 (0.39–0.91) | Ref | 1.06 (0.77–1.45) |
| Adjusted II† | ||||||
| Overall | Ref | 0.99 (0.80–1.24) | Ref | 0.61 (0.40–0.93) | Ref | 1.01 (0.73–1.37) |
| FEV1, 50–70% | Ref | 1.28 (0.91–1.80) | Ref | 0.70 (0.32–1.56) | Ref | 1.23 (0.87–1.75) |
| FEV1 < 50% | Ref | 0.82 (0.60–1.10) | Ref | 0.61 (0.36–1.02) | Ref | 0.82 (0.54–1.26) |
| Rate ratio (95% CI) | ||||||
| Unadjusted | Ref | 0.88 (0.63–1.22) | Ref | 0.64 (0.42–0.99) | Ref | 1.08 (0.74–1.57) |
| Adjusted I | Ref | 0.77 (0.51–1.15) | Ref | 0.38 (0.23–0.63) | Ref | 1.19 (0.75–1.90) |
| Adjusted II | ||||||
| Overall | Ref | 0.80 (0.54–1.19) | Ref | 0.41 (0.25–0.67) | Ref | 1.18 (0.76–1.83) |
| FEV1, 50–70% | Ref | 0.62 (0.33–1.18) | Ref | 0.43 (0.17–1.13) | Ref | 0.74 (0.38–1.44) |
| FEV1 < 50% | Ref | 0.89 (0.55–1.46) | Ref | 0.38 (0.20–0.72) | Ref | 1.21 (0.67–2.19) |
Definition of abbreviation: BODE = body mass index, degree of airflow obstruction, functional dyspnea, exercise capacity; CI = confidence interval; COPD = chronic obstructive pulmonary disease; FEV1 = forced expiratory volume in 1 second; Ref = reference group.
Note: P values for interaction between treatment allocation arm and FEV1 were 0.07 for the risk ratio analysis and 0.01 for the rate ratio analysis in “adjusted II” models.
Adjusted I models are adjusted for BODE index, current oxygen use, pretrial lung disease health care utilization, COPD controller medications, and total COPD medications.
Adjusted II models are adjusted for age, sex, BODE index, smoking history, alcohol use, depressive symptoms, current oxygen use, rapid assessment of physical activity, pretrial lung disease health care utilization, COPD controller medications, and total COPD medications.