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Table 1 Mean (range or SDa) or proportion for selected characteristics of the respondents and the total sample invited to the reproducibility study

From: Test-retest reproducibility of a food frequency questionnaire (FFQ) and estimated effects on disease risk in the Norwegian Women and Cancer Study (NOWAC)

Characteristic Respondents (n = 1488)b Invited (n = 1994)b
Mean age, years (range) 59.9 (46–75) 59.8 (46–75)
Mean weight, kg (SD) 70.3 (12.0) 70.1 (12.0)
Mean height, cm (SD) 165.8 (5.8) 165.7 (5.7)
Mean BMI, kg/m2 (SD) 25.6 (4.1) 25.5 (4.1)
Mean energy intake, MJ/day (SD) 6.44 (1.87) 6.48 (1.90)
Mean physical activity, scale 1–10 (SD) (1 = very low, 10 = very high) 5.3 (1.8) 5.2 (1.8)
Try to lose weight, % 36   35  
Daily smokers, % 23   24  
Teetotalers, % 12   13  
Take cod liver oil supplements, % 42   41  
College or university education, % 37   36  
Retired, % 25   24  
  1. aStandard deviation
  2. bNumber may not total to 1488 or 1994 for each characteristic due to missing values