Sentence examples for certificate control from inspiring English sources
For the birth certificate control comparison, only residence at the time of birth was available.
The results derived from the analyses of these 86 case and birth certificate control pairs were not much different.
Using the birth certificate information, mothers of cases reported smoking less prior or during pregnancy compared to their birth certificate control counterparts.
Additionally, we noted a significantly higher number of multiple births reported among cases compared to controls (8.4 % among the cases; 4.0 % and 3.8 % among the interviewed and birth certificate control groups, respectively).
Based on the sociodemographic characteristics of the birth certificate controls, the percentage that moved during pregnancy may have been even higher among the birth certificate controls, leading to exposure misclassification for the second set of control analyses.
These results suggest that the NCCLS birth certificate controls are representative of the source population from which the cases arose.
The mothers of the 4,971 birth certificate controls, however, had less educational attainment than the mothers of cases (birth certificate information).
A series of methodological evaluations (manuscripts in preparation) indicate that the birth certificate controls are representative of the population base from which the cases arose.
We identified 267 potential birth certificate controls, of which 70 completed and 1 partially completed the interviews (27%) (Puumala et al, 2009).
Because of the longer time needed to enroll birth certificate controls in the main study, the time between the reference date and dust collection was shorter for cases [median years, interquartile range (IQR): 0.92 (0.74–1.26] than for controls [1.66 (1.26–2.24)].
Our prior analysis showed that RDD and birth certificate controls were similar to one another; however, control participants differed from the US population and from non-participants on relevant demographic factors (Puumala et al, 2009).
