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Table 4 Demographics and life style characteristics in the five different user groups. The NOWAC study, 2003–2011, Tromsø, Norway

From: Characterization of heavy users of skin care products among Norwegian women from 2003 to 2011

  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
  1. BMI body mass index, OC oral contraceptive, HRT hormone replacement therapy, IUD intra uterine device
  2. aOne-way analysis of variance, bKruskal-Wallis test, cChi-square test
  3. dDaily physical activity, from 1 = very little to 10 = very much