Background
Persistent maternal smoking during pregnancy, reduction or cessation
during pregnancy, and smoking initiation or resumption postpartum impel
further research to understand these behavioral patterns and opportunities
for intervention.
Objectives
We investigated heterogeneous longitudinal patterns of smoking
quantity to determine if these patterns vary across three maternal age
groups, and whether the influence of individual and contextual risk factors
varies by maternal age.
Methods
Separate general growth mixture models were estimated for mothers
ages 15–25, 26–35, and 36+, allowing different
empirical patterns of an ordinal measure of smoking behavior at six time
points, from preconception through child entry to kindergarten.
Results
We identify five classes for mothers ages 15–25, four classes
for ages 26–35, and three classes for ages 36+. Each age
group presents classes of nonsmokers and persistent heavy smokers.
Intermediate to these ends of the spectrum, each age group exhibited its own
smoking classes characterized by the extent of pregnancy smoking reductions
and postpartum behavior. In all three age groups, class membership can be
distinguished by individual sociodemographic and behavioral characteristics.
Co-resident smokers predicted nearly all smoking classifications across age
groups, and selected neighborhood characteristics predicted classification
of younger (15–25) and older (36+) mothers.
Conclusions
The design, timing, and delivery of smoking prevention and cessation
services, for women seeking to become pregnant and for women presenting for
prenatal or pediatric care, are best guided by individual characteristics,
particularly maternal age, preconception alcohol consumption, and postpartum
depression, but neighborhood characteristics merit further attention for
mothers at different ages.