Fig. 4 Distribution of breastfeeding (n = 607) and non-breastfeeding (n = 56) women among different categories of frequency of any headache (number of attacks during the first 8 weeks) of the puerperium.
"A higher percentage of women than men are moviegoers in all categories of frequency".
During pilot data collection, participants were prompted with categories of frequency of usage.
Because of the relative rarity of frequent drinking, the two upper categories of frequency of alcohol consumption ("2 4 drinks" and "4 or more drinks" per week) were combined for analysis.
In the current analysis, we coded three categories of frequency of consumption consistently across questionnaires from all cohorts (less than once a week, once to three times a week, and four and more times a week).
The mean estimated excess energy expenditure for strenuous activity and various specific activities reported at follow-up (derived from hours spent performing these activities), were compared across categories of frequency of strenuous and any physical activity at baseline.
The 5 categories of frequency ranged from "never or less than once a month" to "every day" and were translated into 0.5, 3, 10, 20 and 30 meals of the specific food each month.
For each item, the questions included nine categories of frequency (never/less than once per month, once per month, 2 3 times per month, once per week, 2 3 times per week, 4 6 times per week, once per day, 2 3 times per day and 4 times per day or more) and four categories of each serving size (the number of cups, glasses or bottles).
To assess alcohol intake during the past year, the FFQ queried consumption of beer during the summer, beer during the rest of the year, liquor or mixed drinks, or wine or wine coolers during the entire year with 10 categories of frequency, ranging from 'never' to '⩾6 times per day', and three portion sizes (<1, 1 2, >2 drinks).
Initially, we analyzed the frequencies of each category of variables (frequency, intensity).
