Table 4.
Demographics and life style characteristics in the five different user groups. The NOWAC study, 2003–2011, Tromsø, Norway
| Use of skin care products | ||||||
|---|---|---|---|---|---|---|
| None | Light | Moderate | Frequent | Heavy | Group comparison | |
| Number of observations | 2131 | 43239 | 28455 | 38037 | 2340 | |
| Characteristics | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | p-value |
| Age at answering questionnaire | 55.0 (5.0) | 54.6 (4.8) | 55.0 (4.9) | 54.9 (4.8) | 54.9 (4.8) | p < 0.01a |
| Education, years | 12.3 (3.9) | 13.1 (3.6) | 12.7 (3.4) | 12.9 (3.4) | 13.0 (3.5) | p < 0.01a |
| Household income, 10 000’s NOK | 47.9 (23.2) | 55.9 (22.0) | 56.7 (21.4) | 58.3 (22.1) | 56.1 (23.4) | p < 0.01a |
| BMI, kg/m2 | 27.7 (5.8) | 25.7 (4.8) | 25.1 (4.0) | 24.7 (3.8) | 24.2 (3.9) | p < 0.01a |
| Physical activityd | 5.1 (2.1) | 5.6 (1.8) | 5.9 (1.8) | 6.1 (1.8) | 6.5 (2.0) | p < 0.01a |
| Age at menarche | 13.2 (1.5) | 13.3 (1.4) | 13.3 (1.4) | 13.3 (1.4) | 13.2 (1.5) | p = 0.36a |
| Age at menopause | 48.5 (5.2) | 49.0 (4.8) | 49.1 (4.7) | 49.0 (4.9) | 48.6 (5.3) | p < 0.01a |
| Age at first birth | 23.9 (4.7) | 24.3 (4.7) | 24.0 (4.4) | 24.0 (4.4) | 23.8 (4.3) | p < 0.01a |
| Number of children | 2.4 (1.4) | 2.2 (1.2) | 2.2 (1.1) | 2.1 (1.1) | 2.1 (1.1) | p < 0.01a |
| Median (25th–75thpercentile) | Median (25th–75thpercentile) | Median (25th–75thpercentile) | Median (25th–75thpercentile) | Median (25th–75thpercentile) | ||
| Breast feeding, months | 11 (4–21) | 12 (6–21) | 11 (5–19) | 10 (5–18) | 10 (4–19) | p < 0.01b |
| Alcohol, gr/day | 0.95 (0–3.3) | 1.98 (0.5–5.5) | 2.55 (0.9–6.2) | 2.92 (1.0–6.3) | 2.53 (0.9–6.3) | p < 0.01b |
| % | % | % | % | % | ||
| Smoking status | ||||||
| Never | 39.9 | 38.8 | 35.0 | 34.0 | 34.4 | p < 0.01c |
| Former | 27.4 | 37.7 | 41.0 | 42.2 | 40.3 | |
| Current | 32.7 | 23.5 | 24.0 | 23.8 | 25.3 | |
| Use of OC | ||||||
| Never | 48.4 | 31.3 | 38.2 | 36.0 | 36.6 | p < 0.01c |
| Former | 51.0 | 58.3 | 61.3 | 63.5 | 62.6 | |
| Current | 0.6 | 0.5 | 0.5 | 0.6 | 0.8 | |
| Use of HRT | ||||||
| Never | 73.8 | 66.6 | 60.6 | 57.8 | 53.8 | p < 0.01c |
| Former | 17.0 | 20.7 | 23.6 | 23.4 | 24.4 | |
| Current | 9.2 | 12.7 | 15.8 | 18.8 | 21.8 | |
| Use of Hormone IUD | ||||||
| Ever | 8.1 | 11.1 | 11.6 | 11.9 | 12.3 |
p < 0.01c
p < 0.01c |
| Current | 5.9 | 10.7 | 10.7 | 10.8 | 9.9 | |
BMI body mass index, OC oral contraceptive, HRT hormone replacement therapy, IUD intra uterine device
aOne-way analysis of variance, bKruskal-Wallis test, cChi-square test
dDaily physical activity, from 1 = very little to 10 = very much