Table 2. Characteristics of the study population (n = 9238) .
| Normal weight (n = 2235) | Overweight (n = 3903) | Obese (n = 3097) | ||||
| Mean or % | SD | Mean or % | SD | Mean or % | SD | |
| Age | 50.7 | 12.1 | 52.6 | 11.3 | 51.0 | 10.5 |
| BMI | 22.9 | 1.9 | 27.4 | 1.4 | 34.6 | 4.5 |
| Sex (men) | 82.6 | 92.6 | 91.5 | |||
| Length of follow-up (month) | 4.1 | 3.0 | 3.9 | 2.8 | 3.6 | 2.5 |
| Assessment of step counts per month | ||||||
| Tracker worn (day) | 22.9 | 9.1 | 22.5 | 9.0 | 21.9 | 8.9 |
| Steps (per day) | 7008 | 3664 | 6458 | 3250 | 5633 | 2983 |
| Assessment of BP per month | ||||||
| Number of measurements | 31.2 | 25.6 | 32.8 | 33.7 | 31.6 | 26.7 |
| Number of measurements per daya | 2.3 | 1.7 | 2.5 | 1.9 | 2.4 | 1.7 |
| Mean of SBP (mm Hg) | 124.3 | 11.7 | 129.6 | 11.1 | 133.9 | 12.0 |
| Mean of DBP (mm Hg) | 75.9 | 8.3 | 79.7 | 8.4 | 83.5 | 8.8 |
Abbreviations: BP, blood pressure; SBP, systolic blood pressure; DBP, diastolic blood pressure; BMI, body mass index; SD, standard deviation.
P for trend or χ2 were all <0.0001, except for the number of BP measurement per month (P = 0.80) and number of BP measurement per day (P = 0.01).
a For days with at least one blood pressure measurement.