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Table 1 Measurement of meal frequencies at age 15, 19 and 27 years and categorisations of variables

From: Meal frequencies in early adolescence predict meal frequencies in late adolescence and early adulthood

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