Table 1.
Subjects characteristics by current smoking status, at interview in 2014.
| Variable | Study population | Non-smoker | Current Smoker | P (NS vs CS)α | |
|---|---|---|---|---|---|
| N | 950 | 845 | 105 | ||
| Sex (% Male) | 23.5 | 23.1 | 26.7 | 0.41 | |
| Age symptom onset (mean, S.D.) | 31.2 (9.7) | 31.4 (9.8) | 29.6 (8.8) | 0.07 | |
| Age diagnosis (mean, S.D.) | 38.2 (9.4) | 38.4 (9.5) | 37.1 (8.6) | 0.18 | |
| Age at interview (mean, S.D.) | 58.7 (10.2) | 59.0 (10.3) | 56.3 (9.2) | 9.3x10−3 | |
| Duration from diagnosis (mean, S.D.) | 20.0 (9.8) | 20.1 (9.9) | 18.7 (8.9) | 0.16 | |
| BMI (kg/m2; mean, S.D.) | 27.1 (6.6) | 27.3 (6.6) | 25.3 (6.3) | 2.9x10−3 | |
| Immunologic therapy in the past 6 months (%) | 64.1 | 63.9 | 66.0 | 0.67 | |
| No alcohol consumption in the past 6 months (%) | 35.4 | 35.0 | 37.5 | 0.61 | |
| MS care (%) | Specialized MS center | 28.3 | 28.6 | 26.0 | 0.85 |
| Private neurologist | 55.3 | 55.5 | 53.9 | ||
| General Practitioner | 6.8 | 6.6 | 7.7 | ||
| Other | 4.5 | 4.4 | 5.8 | ||
| No MS care | 5.2 | 5.0 | 6.7 | ||
| Ethnicity (% Hispanic) | 2.0 | 2.0 | 1.9 | 0.94 | |
| Race (%) | White | 95.0 | 95.2 | 93.3 | 0.09 |
| Black | 2.2 | 2.1 | 2.9 | ||
| Other | 2.4 | 2.5 | 1.9 | ||
| Multiracial | 0.4 | 0.2 | 1.9 | ||
| MS subtype (%) | CIS | 0.7 | 0.8 | 0.0 | 0.54 |
| RR | 53.9 | 53.7 | 55.2 | ||
| SP | 21.0 | 21.4 | 17.1 | ||
| PP | 8.4 | 8.6 | 6.7 | ||
| PR | 3.0 | 2.7 | 4.8 | ||
| DK/Unsure | 11.5 | 11.2 | 13.3 | ||
| Other | 1.6 | 1.4 | 2.9 | ||
| HRQOL subscale (mean, S.D.) |
PF | 37.0 (11.6) | 35.0 (10.3) | 37.2 (11.8) | 0.06 |
| RP | 38.8 (10.5) | 36.1 (9.7) | 39.1 (10.6) | 5.9x10−3 | |
| BP | 45.3 (10.7) | 41.7 (11.1) | 45.7 (10.6) | 2.7x10−4 | |
| GH | 45.8 (10.3) | 42.7 (9.8) | 46.2 (10.4) | 1.2x10−3 | |
| VT | 44.1 (10.2) | 41.4 (9.4) | 44.5 (10.3) | 4.7x10−3 | |
| SF | 44.1 (10.8) | 40.7 (11.1) | 44.5 (10.7) | 2.6x10−4 | |
| RE | 43.9 (12.0) | 37.1 (13.2) | 44.6 (11.7) | 8.7x10−6 | |
| MH | 48.6 (9.8) | 45.0 (10.7) | 49.1 (9.7) | 6.4x10−5 | |
| Number of cigarettes smoked a day | 13.4 (8.6)β | ||||
BMI: body mass index; BP: bodily pain; CIS: clinically isolated syndrome; CS: current smoker; DK: don’t know; GH: general health; MH: mental health; NS: non-smoker; PF: physical functioning; PP: primary progressive; PR: progressive relapsing; RE: role-emotion; RR: relapsing remitting; RP: role-physical; SF: social functioning; SP: secondary progressive; VT: vitality.
α
Bivariate associations between smoking status and individual variables were conducted using Chi-Squared tests and Student’s T-tests for categorical and continuous variables, respectively.
β
N=90