Furthermore, reducing the interval between survey waves improves estimation accuracy but only very slowly.
For the ND25+ group, only two survey waves, at 12 and 24 months, were conducted.
The direction and sources of inequalities in child immunizations have changed between the two survey waves.
We use a unique data set of about 900 observations, which are retrieved from two survey waves.
9The HRS data does not allow for a more disaggregated industry classification that covers all the survey waves.
There were no significant changes in gun carrying prevalence within each individual city over the survey waves.
The patterns and trends are similar for ever-married, never-married, and all women in the three survey waves.
Mean self-reported gun carrying across all survey waves was 8.89% in Chicago, 4.09% in New York City, and 6.03% in Los Angeles (p < 0.001).
We limited our study sample to enrollees who had completed all three Registry survey waves in order to maximize follow-up time and to capture relevant exposure variables.
Chicago had a higher prevalence in self-reported gun carrying among freshman and sophomores across the cumulative four survey waves (p < 0.001).
The study included a total weighted population estimate of 1,137,449 students across the three cities and four survey waves.
