Demographic and socioeconomic characteristics of the study population, questionnaire data from 2006
| Variables | Categories | N | Cases n (%) | N | Controls n (%) | p Value* |
|---|---|---|---|---|---|---|
| Age (years) | Mean (SD) | 311 | 38.9 (6.2) | 353 | 39.7 (4.9) | 0.06 |
| Marital status | Not married/cohabiting | 304 | 47 (15.5) | 346 | 37 (10.7) | 0.07 |
| Parity | <3 | 310 | 208 (67.1) | 349 | 246 (70.5) | 0.35 |
| Education | ≤High school | 293 | 84 (28.7) | 346 | 46 (13.3) | <0.001 |
| Employment | Not working full time† | 299 | 164 (54.8) | 343 | 139 (40.5) | <0.001 |
| Household income (NOK) | Low (<750 000) | 306 | 225 (73.5) | 348 | 168 (48.3) | <0.001 |
| BMI (kg/m2) | ≥25.0 | 303 | 144 (47.5) | 347 | 108 (31.1) | <0.001 |
| Smoking | Daily/sometimes | 299 | 77 (25.8) | 343 | 64 (18.7) | 0.03 |
*A χ2 test.
†Includes those working less than 90%, housewives, students and those on social security.
BMI, body mass index; NOK, Norwegian kroner (750 000 NOK≈100 000 Euros, per August 2012).