Table 1. Comparison of characteristics of subjects who agreed and disagreed to be contacted for a follow-up study, and subjects who participated and did not participate to the medical examination.
| Agreed to follow-up | Disagreed to follow-up | Adjusted OR (95% CI) | Participated | Invited, but did not participate | Adjusted OR (95% CI) | |
|---|---|---|---|---|---|---|
| Subjects n | 8714 | 5449 | 2494 | 4686 | ||
| Age, mean years (SD)* | 51.1 ± 12.9 | 49.8 ± 13.9 | 1.07 (1.04–1.10) | 54.7 ± 11.0 | 49.1 ± 13.3 | 1.49 (1.43–1.56) |
| Female | 53.0 | 54.7 | 0.94 (0.87–1.00) | 54.6 | 52.2 | 1.20 (1.08–1.32) |
| Never smoker | 45.5 | 49.1 | 1 | 45.0 | 46.4 | 1 |
| Former smoker | 38.8 | 31.4 | 1.28 (1.18–1.38) | 44.6 | 35.7 | 1.20 (1.08–1.33) |
| Current smoker | 15.4 | 17.4 | 0.94 (0.85–1.04) | 10.1 | 17.7 | 0.97 (0.86–1.08) |
| Self-reported morbidity | ||||||
| Current asthma | 5.9 | 4.3 | 1.46 (1.24–1.71) | 4.9 | 5.9 | 0.94 (0.75–1.18) |
| COPD | 4.7 | 4.0 | 1.14 (0.96–1.35) | 5.1 | 4.3 | 1.03 (0.81–1.30) |
| Morbidity based on EMR | ||||||
| Subjects included with good quality EMR data n | 6689 | 4253 | 1906 | 3359 | ||
| Asthma (ICPC R96)% | 7.2 | 6.2 | 1.19 (1.02–1.39) | 5.9 | 7.0 | 0.87 (0.68–1.11) |
| COPD (ICPC R95 or R091) | 3.7 | 3.3 | 1.04 (0.84–1.29) | 3.7 | 3.5 | 0.82 (0.60–1.11) |
Data are presented as mean ±SD or %, unless otherwise stated. The likelihood of agreeing to follow-up / being a participant is modeled for different characteristics with logistic regression. OR (95% CI) were adjusted for age, gender and smoking habits. Bold type indicates statistical significance (p < 0.05). ICPC: International Classification of Primary Care.
*OR(95% CI) for an increase per 10 year.