Table 1

Measurement of meal frequencies at age 15, 19 and 27 years and categorisations of variables
Item description Response categories Categorisation when applied as determinant variable Dichotomization when applied as outcome variable
Age 15
Breakfast/lunch
How often do you eat .... 1) Every day 1) Daily
a) Breakfast 2) Several times a week 2) Several times a week
b) Lunch 3) Once a week 3) More seldom
c) Hot evening meal 4) More seldom
Evening meal
1) Daily
2) More seldom than daily
Age 19
Breakfast/lunch All three meal types
How often do you eat .... 1) Every day 1) Daily 1) Daily
a) Breakfast 2) Several times a week 2) Several times a week 2) More seldom than daily
b) Lunch 3) Once a week 3) More seldom
c) Hot evening meal 4) More seldom
5) Never Evening meal
1) Daily
2) More seldom than daily
Age 27
All three meal types
How often do you eat .... 1) Every day 1) Daily
a) Breakfast 2) Several times a week 2) More seldom than daily
b) Lunch 3) Once a week
c) Evening meala 4) More seldom
5) Never

aObserve the change in item formulation from “hot evening meal” at baseline and first follow-up to “evening meal” at second follow-up.

Pedersen et al.

Pedersen et al. BMC Public Health 2013 13:445   doi:10.1186/1471-2458-13-445

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