Table 2.
Averages and proportions (95% confidence intervals) of different characteristics across invited and participants, and predicted values for the invited population based on early and late participants in STROKESTOP II.
| Variable | True values in full invited population (n = 14,064) | Values among participants (n = 6,867) | Substitution based on late participants | Linear extrapolation |
|---|---|---|---|---|
| Sex | ||||
| Male |
0.47 (0.46–0.48) |
0.46 (0.45–0.47) |
0.48 (0.44–0.51) |
0.50 (0.46–0.53) |
| Civil status | ||||
| Married |
0.54 (0.53–0.55) |
0.59 (0.58–0.60) |
0.58 (0.54–0.62) |
0.59 (0.56–0.63) |
| Unmarried |
0.10 (0.09–0.10) |
0.081 (0.074–0.087) |
0.081 (0.066–0.097) |
0.089 (0.071–0.108) |
| Divorced |
0.23 (0.22–0.23) |
0.21 (0.20–0.22) |
0.21 (0.19–0.24) |
0.20 (0.18–0.23) |
| Widowed |
0.14 (0.13–0.14) |
0.13 (0.12–0.14) |
0.12 (0.10–0.14) |
0.11 (0.09–0.14) |
| Education | ||||
| Primary |
0.24 (0.23–0.24) |
0.18 (0.17–0.19) |
0.18 (0.16–0.21) |
0.21 (0.18–0.23) |
| Secondary |
0.40 (0.39–0.41) |
0.41 (0.40–0.42) |
0.42 (0.38–0.45) |
0.38 (0.35–0.42) |
| Tertiary |
0.34 (0.33–0.34) |
0.40 (0.39–0.42) |
0.39 (0.35–0.42) |
0.39 (0.36–0.42) |
| Missing |
0.026 (0.023–0.028) |
0.0092 (0.0069–0.011) |
0.013 (0.0063–0.020) |
0.022 (0.013–0.032) |
| Income | ||||
| Low |
0.32 (0.32–0.33) |
0.24 (0.23–0.25) |
0.26 (0.23–0.29) |
0.28 (0.25–0.31) |
| Medium |
0.49 (0.48–0.49) |
0.52 (0.51–0.53) |
0.49 (0.44–0.53) |
0.48 (0.45–0.52) |
| High |
0.19 (0.18–0.20) |
0.24 (0.23–0.25) |
0.25 (0.22–0.28) |
0.24 (0.21–0.27) |
| Origin | ||||
| Immigrant |
0.22 (0.21–0.23) |
0.16 (0.16–0.17) |
0.19 (0.17–0.22) |
0.21 (0.18–0.23) |
| Morbidity | ||||
| Charlson |
0.69 (0.68–0.71) |
0.56 (0.54–0.59) |
0.59 (0.54–0.65) |
0.63 (0.58–0.69) |
| Systolic BP | – | 139 (139–139) |
140 (132–147) |
139 (138–141) |
| Diastolic BP | – | 81 (81–81) |
82 (77–86) |
81 (80–82) |
| Log NT-proBNP | – | 5.08 (5.06–5.10) |
5.13 (4.85–5.40) |
5.12 (5.06–5.17) |
| Detected AF | – | 0.024 (0.020–0.028) |
0.023 (0.015–0.031) |
0.017 (0.0080–0.026) |
Sociodemographic variables were obtained from Statistics Sweden whereas hospitalizations (used to calculate the Charlson comorbidity index) were obtained from the National Board of Health and Welfare. Sociodemographic variables refer to 2015; hospitalizations between 2001 and 2015 were used. Blood pressure (BP), NT-proBNP, and atrial fibrillation (AF) were determined at the screening.