This behavior showed no significant difference between the dose-response groups.
Mortality data from 27 experiments with 851 dose-response groups, in which doses were protracted by rate and/or fractionation, were used to simultaneously estimate all rate constants by maximum-likelihood methods.
To determine the dose response, four groups of fish were inoculated with S. iniae via the gills with a dose of 5.0×105, 2.6×106, 5.0×106, or 1.0×108 CFU/fish.
Where sufficient sample size permitted, we assessed dose response by grouping organo-chlorine serum concentrations into three categories: below the minimum detectable limit, detection limit up to median concentration among persons with self-reported diabetes, and above the median concentration.
35 All 3 doses showed a reduction, but there was no dose response and the group sizes were low, ranging from 4 to 7 mice per group.
It is also possible that the mix of shop workers in diesel locomotive shops and in shops not responsible for locomotive repair who were not exposed to operating trains contributed to the lack of a dose response in that group, because there was no way to separate workers with and without exposure using job titles.
Urinary phthalate concentrations were considered both as log-transformed continuous measures (assuming linearity of dose response) and as grouped into quintiles to avoid the assumption of linearity.
Due to the difference between the 2002 and 2003 VLA scrapie flock cohort survival times we were not able to investigate the possible dose response effect across Groups 8-10.
It was not possible to demonstrate a statistically significant dose response relationship for Groups 11-13, which grazed with the VLA scrapie flock for varying lengths of time, which suggests that transmission occurs easily and early in the first six weeks of life, when the lambs are putatively most susceptible [ 28, 29].
However, lead effects on the odds of elevated diastolic blood pressure were attenuated in both groups, The odds ratio for the fifth quintile relative to the reference quintile was 1.33 (95% CI: 0.65, 2.73) and 1.82 (95% CI: 0.91, 3.64), in the low and high AL group, respectively, and the linear dose response trends in either group were no longer statistically significant.
There was no association between midwife performance scores and supervision frequency in the control group of a study in the Philippines but there was a dose response in the intervention group with improved supervision suggesting that increased frequency only improves performance if quality supervision is in place (37).
