Table II.
Demographic characteristics of study participants (n = 196) by tertile (tertile 1 = low; tertile 2 = medium; tertile 3 = high) of MEDLIFE1
| Overall (n = 196) |
Low (n = 71) |
Medium (n = 70) |
High (n = 55) |
P-trend | |
|---|---|---|---|---|---|
| Female | 166 (84.7) | 55 (77.5) | 64 (91.4) | 47 (85.5) | 0.168 |
| School affiliation | |||||
| Teacher | 75 (38.3) | 21 (29.6) | 33 (47.1) | 21 (38.2) | 0.132 |
| Parent | 59 (30.1) | 22 (31.0) | 18 (25.7) | 19 (34.5) | |
| School staff | 62 (31.6) | 28 (39.4) | 19 (27.1) | 15 (27.3) | |
| Age | 41.4 (9.0) | 40.6 (8.9) | 39.5 (8.8) | 44.8 (8.7) | 0.010 |
| BMI (Kg/m) | 24.1 (4.1) | 24.5 (4.5) | 23.9 (3.9) | 23.9 (3.6) | 0.383 |
| Household income, > 22,500 € | 115 (58.7) | 23 (32.9) | 27 (38.6) | 29 (53.7) | 0.022 |
| Education level, high* | 132 (67.3) | 54 (76.1) | 54 (77.1) | 45 (81.8) | 0.541 |
| Smoking | |||||
| Current smoker | 27 (13.8) | 14 (19.7) | 9 (13) | 4 (7.3) | 0.044 |
| Non-smoker/former | 168 (85.7) | 57 (80.3) | 60 (87.0) | 51 (92.7) | 0.044 |
| Self-perceived job strain (range 0–5 points) | 3.1 (1.1) | 3.1 (1.1) | 3.1 (1.1) | 3.2 (1.0) | 0.483 |
| Self-perceived overall stress in life (range 0–5 points) | 3.1 (1.0) | 3.1 (1.1) | 3.1 (1.1) | 3.1 (0.9) | 0.923 |
| Self-perceived healthy lifestyle | 135 (68.9) | 34 (47.9) | 52 (74.3) | 49 (89.1) | < 0.001 |
Values are mean and (standard deviation) or n and (percentage).
The polynomial contrast and chi square test were used to determine P-linear trend for continuous and categorical variables, respectively.
Education level was first classified according to the guidelines of the Instituto Nacional de Estadística (INE; www.ine.es) and then categorized into three bands according to the International Standard Classification of Education (ISCED; http://www.uis.unesco.org/Education/Pages/internationalstandard-classification-of-education.aspx, 2011): low (none or primary studies; ISDED 0–2), medium (completed high school; ISCED 3 or 4) and high (high qualification or completed university degree; ISCED 5 or 6).