Table 2.
Baseline characteristics of subjects.
| Characteristics | M ± SE or N (%) | |||
|---|---|---|---|---|
| 0 e-mails (n = 227) | 1–7 e-mails (n = 63) | ≥8 e-mails (n = 97) | P value | |
| Age (years) | 56.7 ± 0.5 | 57.0 ± 0.9 | 55.6 ± 0.7 | 0.40 |
| Sex: Female (%) | 120 (52.9) | 39 (61.9) | 70 (72.2) | 0.005 |
|
| ||||
| Household income: | ||||
| <$60k | 80 (35.2) | 16 (25.4) | 32 (33.0) | 0.63 |
| $60 k–$99,999 | 81 (35.7) | 24 (38.1) | 37 (38.1) | |
| ≥$100 k | 66 (29.2) | 23 (36.5) | 28 (28.9) | |
|
| ||||
| Body mass index (kg/m2) | ||||
| <25 | 41 (18.1) | 11 (17.5) | 18 (18.6) | 0.85 |
| 25–29.9 | 88 (38.8) | 29 (46.0) | 41 (42.3) | |
| ≥30 | 98 (43.2) | 23 (36.5) | 38 (39.2) | |
|
| ||||
| Waist circumference | ||||
| F > 88 cm, M > 102 cm | 143 (63.0) | 36 (57.1) | 60 (61.9) | 0.70 |
|
| ||||
| Cardiovascular risk factors | ||||
| Total cholesterol mmol/L | 5.3 ± 0.1 | 5.1 ± 0.1 | 5.4 ± 0.1 | 0.23 |
| Diabetes | 16 (7.0) | 5 (7.9) | 2 (2.1) | 0.17 |
| Smoking | 8 (3.5) | 3 (4.8) | 6 (6.3) | 0.55 |
| Framingham 10-yr absolute risk | 9.5 ± 0.4 | 8.8 ± 0.7 | 9.1 ± 0.6 | 0.65 |
|
| ||||
| Psychological distress | ||||
| Depression | 7.4 ± 0.5 | 7.9 ± 1.0 | 8.8 ± 0.8 | 0.37 |
| Stress | 14.5 ± 0.4 | 14.5 ± 0.8 | 15.6 ± 0.7 | 0.94 |
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| Readiness to change | ||||
| Exercise | 3.6 ± 0.04 | 3.3 ± 0.1 | 3.5 ± 0.1 | 0.06 |
| Diet | 3.5 ± 0.04 | 3.5 ± 0.1 | 3.5 ± 0.1 | 0.84 |