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We categorised duration of use of pharmacotherapy based on a systematic review of studies assessing adherence to smoking cessation medication.
The relationship between breastfeeding duration and weight status was investigated in a logistic regression model using categorised duration of breastfeeding as the primary explanatory variable.
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We categorised gestational duration into three groups: 32 completed weeks or less, 33 34 weeks, and 35 weeks or more.
Passive smokers were categorised by duration of residing with a smoker (≥20 or <20 years) and weekly exposure time for (≥20 or <20 h per week).
When immigrants were categorised by duration, recent immigrants with less than 10 years of residence had lower odds of PTB than their Canadian counterparts, but this reversed among those with 10 or more years of residence.
Because of the small number who slept for less than 7 h and more than 8 h, we categorised sleep duration into three groups: ⩽6, 7 8, and ⩾9 h per day.
20 In categorising duration of use, we made no distinction between whether or not the medication was combined with behavioural counselling as this distinction was inconsequential in the analysis.
Finally, categorising cumulative duration and cumulative dosage of pioglitazone into three categories produced results consistent with those of our primary analyses on duration and dose (data not shown).
Information regarding the dose of GC and duration of exposure was collected and categorised by cumulative duration of GC therapy as follows: no GC exposure (never took GCs), <6 months, 6 months to 2 years and >2 years.
Ignoring duration of residence may mask important disparities in preterm delivery between immigrants and non-immigrants, and between immigrant subgroups categorised by their duration of residence.
‡Sleep duration categorised according to a median split and rounded to the nearest hour.
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