Appendix 1.
Calibration for conversion of sitting to recumbent blood pressure values and vice versa.
In the Västerbotten Intervention Programme (VIP), blood pressures were measured with participants in a recumbent position until 1 September 2009. After that date, measurements were taken with participants in a seated position. The calibration process was done separately for men and women in each age-cohort. A total of 648 participants were selected from 25 of the 40 primary health care centres, represent the whole county and included both urban and rural areas. Two blood pressure measurements were taken in each recumbent and seated position. The first measurement was done after 5 min rest, and the second 5 min after the first one. The reading was done at the nearest 2 mmHg. The mean value of the two readings in each position was used for the validation. Readings with a difference between the values exceeding 30 mmHg in systolic blood pressure and 25 in diastolic pressure were excluded.
| 40 yr | Men | Sitting systolic BP | 21.612+(0.835 x Recumbent systolic BP) |
| Recumbent systolic BP | 24.595+(0.792 x Sitting systolic BP) | ||
| Sitting diastolic BP | 14.463+(0.848 x Recumbent diastolic BP) | ||
| Recumbent diastolic BP | 17.282+(0.753 x Sitting diastolic BP) | ||
| Women | Sitting systolic BP | 19.922+(0.830 x Recumbent systolic BP) | |
| Recumbent systolic BP | 8.669+(0.919 x Sitting systolic BP) | ||
| Sitting diastolic BP | 13.680+(0.847 x Recumbent diastolic BP) | ||
| Recumbent diastolic BP | 5.784+(0.890 x Sitting diastolic BP) | ||
| 50 yr | Men | Sitting systolic BP | 19.748+(0.861 x Recumbent systolic BP) |
| Recumbent systolic BP | 9.850+(0.910 x Sitting systolic BP) | ||
| Sitting diastolic BP | 13.390+(0.878 x Recumbent diastolic BP) | ||
| Recumbent diastolic BP | 12.363+(0.812 x Sitting diastolic BP) | ||
| Women | Sitting systolic BP | 12.723+(0.906 x Recumbent systolic BP) | |
| Recumbent systolic BP | 16.051+(0.859 x Sitting systolic BP) | ||
| Sitting diastolic BP | 17.675+(0.800 x Recumbent diastolic BP) | ||
| Recumbent diastolic BP | 13.566+(0.798 x Sitting diastolic BP) | ||
| 60 yr | Men | Sitting systolic BP | 20.246+(0.853 x Recumbent systolic BP) |
| Recumbent systolic BP | 7.763+(0.936 x Sitting systolic BP) | ||
| Sitting diastolic BP | 16.308+(0.833 x Recumbent diastolic BP) | ||
| Recumbent diastolic BP | 9.029+(0.864 x Sitting diastolic BP) | ||
| Women | Sitting systolic BP | 13.817+(0.900 x Recumbent systolic BP) | |
| Recumbent systolic BP | 9.999+(0.914 x Sitting systolic BP) | ||
| Sitting diastolic BP | 15.084+(0.836 x Recumbent diastolic BP) | ||
| Recumbent diastolic BP | 7.992+(0.870 x Sitting diastolic BP) |